I need to do a project involving Pol Pot and his form of communism so I'm looking for a few sources that explains the basics of Maoism, Stalinism, Leninism etc. I would also appreciate comments, as long as there are sources backing you up that I can use when comparing the different ideologies.
I would start with primary sources:
Joseph Stalin wrote Marxism and the National Question https://www.marxists.org/reference/archive/stalin/works/1913/03.htm
Quotations from Chairman Mao Tse-tung http://www.marx2mao.com/PDFs/QCM66.pdf
Mao's "Little Red Book" had huge influence in China during and after the Cultural Revolution and was widely memorized and quoted by party members.
Also, don't skip out on the Communist Manifesto, as it forms the foundation for Soviet, Chinese and all other forms of communism.