These two textbooks are one set, which are aimed at the postgraduate entrance examination textbooks of public security universities. After investigation, it is a genuine book published by Liaoning University Press and compiled by Police Research Teaching and Research Group. Each one is aimed at a specialized course, the blue one is the basic theory and management of public security, and the green one is the second door of legal basis. Online comments are generally good, and netizens generally report that there are no other reliable teaching materials.