曲家源著《卢沟桥事变起因考论——兼与日本有关历史学者商榷》是研究卢沟桥事变起因的专著。该书为“毋忘国耻历史丛书”之一,1992年6月由中国华侨出版社出版。作者围绕卢沟桥事变最初发生时的所谓“第一枪”问题、“一士兵失踪”问题、“进城搜查”问题等几个争论焦点,详尽介绍日本自战后以来在 Qu Jiayuan’s Research on the Causes of the Lugou Bridge Incident - Also as Discussion with the Japanese Historians about It is the Monograph for Studying the Causes of the Lugouqiao Incident. This book is one of the “Unforgettable History of National Humiliation”, published by Chinese Overseas Chinese Press in June 1992. The author focuses on several controversial issues such as the so-called “first shot” at the time of the Lugouqiao Incident and the “disappearance of a soldier” and the “search into the cities.” This article details Japan’s