李叔同著. 过往不恋 将来不负（心经修行课）. 北京联合出版公司.
Chicago Style (17th ed.) Citation李叔同著. 过往不恋 将来不负（心经修行课）. 北京联合出版公司.
MLA (8th ed.) Citation李叔同著. 过往不恋 将来不负（心经修行课）. 北京联合出版公司.
Warning: These citations may not always be 100% accurate.
APA (7th ed.) Citation