Hi! Sorry for not replying for some time but we don't get any notification when a new thread appears. If my data is up to date, to create the mod we used about 45 sources in total. This includes Codices, Books and various Articles. i'd advise you checking the "Open Mesoamerica Universalis Encylopedia" decision in the "mission and decisions" tab and look through the "Sources and further reading" section. I am sure you will find what you are searching for there.