The few principal written records of the School of Diplomacy that exist today are the thirteenth chapter of the 'Book of Gui' or 'Gui Gu-zi', the thirty-third chapter of 'Annals of the Warring States Period' (not about the School of Diplomacy’s followers but primarily the words and actions of its advisors as well as actual combat case studies), the thirty-first chapter of 'Su Zi' and the tenth chapter of 'Zhang Zi'.