https://www.codeproject.com/Questions/467128/book-vs-websites-for-learning-OOP-in-Csharp-net
http://a5theory.com/oops-concepts/
https://www.quora.com/What-is-a-good-programming-language-for-learning-object-oriented-programming-concepts-Trying-to-learn-OO-concepts-using-PHP-is-confusing
https://www.youtube.com/watch?v=Y7rq6o6UDXc
https://www.google.com/search?q=Alan+Kay+about+object+oriented+programming.&rlz=1C1PRFC_enBD752BD752&source=lnms&tbm=vid&sa=X&ved=0ahUKEwjJkaSZytbWAhWBDsAKHRg_DrsQ_AUICigB&biw=1366&bih=662
https://www.quora.com/Why-do-you-love-C/answer/Matthew-Schrager
https://softwareengineering.stackexchange.com/questions/114362/which-is-most-important-to-learn-oop-first-or-to-learn-the-oop-language-you-want
https://softwareengineering.stackexchange.com/questions/96504/how-can-i-teach-a-bright-person-with-no-programming-experience-how-to-program/96722
