diff --git a/books/free-programming-books.md b/books/free-programming-books.md
index 00503b6166f8e66cda19f02e6a8858454e0a775f..71727b22e415b435b4a81914cf98b669cfc75551 100644
--- a/books/free-programming-books.md
+++ b/books/free-programming-books.md
@@ -2435,9 +2435,10 @@ Kerridge (PDF) (email address *requested*, not required)
 * [Hitchhiker's Guide to Python!](http://docs.python-guide.org/en/latest/) (2.6)
 * [How to Code in Python 3](https://assets.digitalocean.com/books/python/how-to-code-in-python.pdf) - Lisa Tagliaferri (PDF)
 * [How to Make Mistakes in Python](http://www.oreilly.com/programming/free/files/how-to-make-mistakes-in-python.pdf) - Mike Pirnat (PDF) (1st edition)
-* [How to Think Like a Computer Scientist: Learning with Python, Interactive Edition](http://interactivepython.org/courselib/static/thinkcspy/index.html) (3.2)
-  * [How to Think Like a Computer Scientist: Learning with Python](http://www.greenteapress.com/thinkpython/thinkCSpy/) - Allen B. Downey, Jeff Elkner and Chris Meyers (2.4)
-  * [Think Python 2e](https://greenteapress.com/wp/think-python-2e/) - Allen B. Downey (2.x & 3.0)
+* [How to Think Like a Computer Scientist: Learning with Python, Interactive Edition](https://runestone.academy/runestone/books/published/thinkcspy/index.html) - Brad Miller, David Ranum, Jeffrey Elkner, Peter Wentworth, Allen B. Downey, Chris Meyers, and Dario Mitchell (3.2)
+  * [How to Think Like a Computer Scientist: Learning with Python 1st Edition](https://greenteapress.com/wp/learning-with-python/) - Allen B. Downey, Jeff Elkner and Chris Meyers (2.4) (HTML, PDF)
+  * [How to Think Like a Computer Scientist: Learning with Python 2nd Edition](https://openbookproject.net/thinkcs/python/english2e/) - Jeffrey Elkner, Allen B. Downey, and Chris Meyers (Using Python 2.x)
+  * [How to Think Like a Computer Scientist: Learning with Python 3 (RLE)](https://openbookproject.net/thinkcs/python/english3e/) - Peter Wentworth, Jeffrey Elkner, Allen B. Downey, and Chris Meyers [(PDF)](https://www.ict.ru.ac.za/Resources/cspw/thinkcspy3/thinkcspy3.pdf)
 * [Intermediate Python](http://book.pythontips.com/en/latest/index.html#) - Muhammad Yasoob Ullah Khalid (1st edition)
 * [Introduction to Programming with Python](http://opentechschool.github.io/python-beginners/en/) (3.3)
   * [Introduction to Programming Using Python](http://python-ebook.blogspot.co.uk) - Cody Jackson (1st edition) (2.3)
@@ -2499,6 +2500,8 @@ Kerridge (PDF) (email address *requested*, not required)
 * [The Standard Python Library](https://web.archive.org/web/20200626001242/http://effbot.org/librarybook/) - Fredrik Lundh
 * [Think Complexity](https://greenteapress.com/wp/think-complexity-2e/) - Allen B. Downey (2nd Edition) (PDF, HTML)
 * [Think DSP - Digital Signal Processing in Python](https://greenteapress.com/wp/think-dsp/) - Allen B. Downey (PDF, HTML)
+* [Think Python 2nd Edition](https://greenteapress.com/wp/think-python-2e/) - Allen B. Downey (3.x) (HTML, PDF)
+  * [Think Python First Edition](https://greenteapress.com/wp/think-python/) - Allen B. Downey (2.x) (HTML, PDF)
 * [Tiny Python 3.6 Notebook](https://github.com/mattharrison/Tiny-Python-3.6-Notebook) - Matt Harrison (3.6)
 * [Web2py: Complete Reference Manual, 6th Edition (pre-release)](http://web2py.com/book) (2.5 - 2.x)