diff --git a/free-programming-books-de.md b/free-programming-books-de.md
index 7d800f23bdda081dbe629fd9abb1105794c4a713..83a491ac98bb6e927b1bd4ad4691dc3cead5a972 100644
--- a/free-programming-books-de.md
+++ b/free-programming-books-de.md
@@ -1,4 +1,5 @@
 ###Index
+* [Unabhängig von der Programmiersprache](#unabh%C3%A4ngig-von-der-programmiersprache)
 * [Android](#android)
 * [C](#c)
 * [C++](#c-1)
@@ -15,6 +16,10 @@
 * [Unix](#unix)
 * [Visual Basic](#visual-basic)
 
+###Unabhängig von der Programmiersprache
+
+* [Scrum und XP im harten Projektalltag](http://www.infoq.com/resource/news/2007/06/scrum-xp-book/en/resources/ScrumAndXpFromTheTrenchesonline_German.pdf)
+
 ###Android
 
 * [Grundlagen und Programmierung](http://www.dpunkt.de/ebooks_files/free/3436.pdf)
diff --git a/free-programming-books-es.md b/free-programming-books-es.md
index e895e112c9faa3cf839c50140b937c76d52b413c..c935b6cd09f442aae1015fe13fe6385ad3504623 100644
--- a/free-programming-books-es.md
+++ b/free-programming-books-es.md
@@ -1,7 +1,8 @@
 ###Index
-* [Agnósticos](#agnostico)
+* [Agnósticos](#agnosticos)
     * [Algoritmos y Estructuras de Datos](#algoritmos)
     * [Ciencia Computacional](#ciencia-computacional)
+    * [Metodologías de desarrollo de software](#metodolog%C3%ADas-de-desarrollo-de-software)
 * [Android](#android)
 * [Assembly Language](#assembly-language)
 * [Metalistas](#metalistas)
@@ -16,14 +17,17 @@
 
 ###Agnosticos
 
-###Algoritmos
+####Algoritmos
 * [Temas selectos de estructuras de datos](http://www.matematicas.unam.mx/jloa/publicaciones/estructurasdeDatos.pdf) (PDF)
 * [Breves Notas sobre Análisis de Algoritmos](http://www.matematicas.unam.mx/jloa/publicaciones/analisisdeAlgoritmos.pdf) (PDF)
 
-###Ciencia Computacional
+####Ciencia Computacional
 * [Breves Notas sobre Teoría de la Computción](http://www.matematicas.unam.mx/jloa/publicaciones/teoria.pdf) (PDF)
 * [Breves Notas sobre Autómatas y Lenguajes](http://www.matematicas.unam.mx/jloa/publicaciones/automatasyLenguajes.pdf) (PDF)
 
+####Metodologías de desarrollo de software
+* [Scrum y XP desde la trincheras](http://www.proyectalis.com/wp-content/uploads/2008/02/scrum-y-xp-desde-las-trincheras.pdf)
+
 ###Android
 * [Curso de Programación Android](http://www.sgoliver.net/blog/wp-content/uploads/2011/11/Manual-Programacion-Android-SgoliverNet-v3-muestra.zip) (PDF) by Salvador Gómez Oliver
 
diff --git a/free-programming-books-fr.md b/free-programming-books-fr.md
index f66b2d1d2be4fbc172eabb3aff2f33eb896738cd..7ec8fc589929e50b4d984b2647f06628b45dd282 100644
--- a/free-programming-books-fr.md
+++ b/free-programming-books-fr.md
@@ -58,6 +58,10 @@
 
 * [Systèmes Informatiques (C, Unix/Linux,...)](http://sinf1252.info.ucl.ac.be/), par Olivier Bonaventure ([sources](https://github.com/obonaventure/SystemesInformatiques))
 
+####Méthodes de développement
+
+* [Scrum et XP depuis les tranchées](http://www.infoq.com/resource/news/2007/06/scrum-xp-book/en/resources/ScrumAndXpFromTheTrenches_French.pdf), par Henrik Kniberg
+
 ###Assembleur
 
 * [Initiation à la programmation en assembleur 64 bits](http://www.ilv-edition.com/librairie/initiation-programmation-assembleur-bits.html), par Pierre Jourlin
diff --git a/free-programming-books-it.md b/free-programming-books-it.md
index 2f97351da3b11b2218973894e9ad97f4b7cef458..a5f769a7f12b65096756b623aceb4cfa238f2100 100644
--- a/free-programming-books-it.md
+++ b/free-programming-books-it.md
@@ -1,4 +1,6 @@
 ###Index
+* [Agnostico](#agnostico)
+    * [Metodologie di sviluppo del software](#metodologie-di-sviluppo-del-software)
 * [Android](#android)
 * [BASH](#bash)
 * [C](#c)
@@ -12,6 +14,12 @@
 * [Visual Basic](#visual-basic)
 
 
+###Agnostico
+
+####Metodologie di sviluppo del software
+
+* [Scrum e XP dalle trincee](http://www.open-ware.org/ita/news/kniberg1.htm)
+
 ###Android
 
 * [Guida programmazione Android 4.2](http://www.sprik.it/guida/Android4_2.pdf)
diff --git a/free-programming-books-ru.md b/free-programming-books-ru.md
index f08a0b1850035b4ab10d7ecac5717cd9122c0dd6..3c60b98a8ff15b709df12491b3ad485f868a74c8 100644
--- a/free-programming-books-ru.md
+++ b/free-programming-books-ru.md
@@ -1,5 +1,6 @@
 ###Index
 * [Списки книг](#meta-lists)
+* [Language Agnostic](#language-agnostic)
 * [Bash](#bash)
 * [CoffeeScript](#coffeescript)
 * [Git](#git)
@@ -17,6 +18,9 @@
 ###Meta-lists
 * [Книги со свободной ценой](http://www.books.ru/knigi-so-svobodnoi-tsenoi-3129328/)
 
+###Language Agnostic
+
+* [Scrum и XP: заметки с передовой](http://scrum.org.ua/wp-content/uploads/2008/12/scrum_xp-from-the-trenches-rus-final.pdf)
 
 ###Bash
 
diff --git a/free-programming-books.md b/free-programming-books.md
index 538c205e3efca379658ca15fdd81e8afcf93c794..f6075a05caedc33892272688db02e17cdf8563bd 100644
--- a/free-programming-books.md
+++ b/free-programming-books.md
@@ -265,6 +265,7 @@
 * [Don't Just Roll the Dice](http://www.neildavidson.com/dontjustrollthedice.html)
 * [Data-Oriented Design](http://www.dataorienteddesign.com/dodmain/dodmain.html)
 * [Software Engineering for Internet Applications](http://philip.greenspun.com/seia/)
+* [Scrum and XP from the Trenches](http://www.infoq.com/minibooks/scrum-xp-from-the-trenches)
 * [Web API Design](https://blog.apigee.com/detail/announcement_new_ebook_on_web_api_design)
 * [OAuth - The Big Picture](http://pages.apigee.com/oauth-big-picture-ebook.html)