Update free-programming-books-en.md (#2771)

* Update free-programming-books.md

* Update free-programming-books.md

* Update free-programming-books.md

* Update free-programming-books.md

* add notations

* alphabet

free-programming-books.md

@@ -1427,8 +1427,10 @@ Kerridge (PDF) (email address *requested*, not required)
 * [Eloquent JavaScript 2nd edition](http://eloquentjavascript.net) - Marijn Haverbeke
 * [Exploring ES6](http://exploringjs.com/es6/) - Dr. Axel Rauschmayer
 * [Google JavaScript Style Guide](https://google.github.io/styleguide/javascriptguide.xml)
+* [Human JavaScript](http://read.humanjavascript.com/ch01-introduction.html)
 * [JavaScript Allongé](https://leanpub.com/javascript-allonge/read) - Reginald Braithwaite
 * [JavaScript Bible](http://media.wiley.com/product_ancillary/28/07645334/DOWNLOAD/all.pdf) (PDF)
+* [JavaScript Challenges Book](https://tcorral.github.io/javascript-challenges-book/)
 * [JavaScript Enlightenment](http://www.javascriptenlightenment.com) - Cody Lindley
 * [JavaScript ES6 and beyond](https://github.com/AlbertoMontalesi/JavaScript-es6-and-beyond-ebook) - Alberto Montalesi (PDF, epub)
 * [JavaScript For Cats](http://jsforcats.com)
@@ -1448,6 +1450,7 @@ Kerridge (PDF) (email address *requested*, not required)
 * [Mastering JavaScript High Performance](https://www.packtpub.com/packt/free-ebook/javascript-high-performance) - Chad R. Adams, Packt. (email address *requested*, not required)
 * [Mozilla Developer Network's JavaScript Guide](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide)
 * [O'Reilly Programming JavaScript Applications](http://chimera.labs.oreilly.com/books/1234000000262/)
+* [Object-Oriented JavaScript](https://www.packtpub.com/packt/free-ebook/object-oriented-javascript-pdf-ebook) - Stoyan Stefanov, Kumar Chetan Sharma (email address *requested*, not required)
 * [Oh My JS](https://web.archive.org/web/20150317231950/https://leanpub.com/ohmyjs/read) - Azat Mardanov
 * [Patterns For Large-Scale JavaScript Application Architecture](http://addyosmani.com/largescalejavascript/) - Addy Osmani
 * [Speaking JavaScript](http://speakingjs.com/es5/) - Dr. Axel Rauschmayer