This is a (hopefully) near-complete list of all the constitutions of every socialist state, that has followed Marxism-Leninism or some variant of it. In light of u/bayarea415's megapost analyzing the CCP constitution, I have made this list as a go-to source for those who want to read, analyze and compare the different constitutions of all the Marxist-Leninist states that have existed over the years. This is not a complete list; I will update it as I track down more of them.

archive.org

One of the few books on the MPR I've been able to find, and man is this thing huge. Goes all the way from the beginning of civilization in Mongolia to the 1970s.