Jacques legoff: medieval intellectual, St. Louis;
Raduri: Montayou;
George Dolby: knight, woman and priest;
Gulevich: the category of medieval culture;
Hoizinha: the autumn of the Middle Ages, or the decline of the Middle Ages;
Henry Pirener: Medieval cities, and so on.
If you want to have a more comprehensive understanding of the economic and social state of that era, it is recommended to refer to:
Carlo Cipolla, editor-in-chief: European Economic History, Volume I;
Mark Yao: A Study on the Feudal Economic Form in Western Europe;
Marc Bloch: feudal society;
Huang Chungao: feudal society in Western Europe;
On political thoughts;
Burns and others: the history of political thought in Cambridge in the Middle Ages;
Quentin skinner: the foundation of modern political thought;
Peng Xiaoyu: Study on Church Law.