E-BOOK
- https://www.free-ebooks.net/computer-sciences-textbooks/
- https://bookboon.com/en/it-programming-ebooks
- https://www.pdfdrive.com/computer-science-books.html
- http://www.freebookcentre.net/CompuScience/compscCategory.html
- https://www.e-booksdirectory.com/computer-science.php?gclid=EAIaIQobChMI_IuDyobJ4AIVg5OPCh06lALBEAMYASAAEgLRrfD_BwE
- http://freecomputerbooks.com/