APA引文

Richards, P. H. (2002). Law of contract (5th ed.). Longman.

芝加哥风格引文

Richards, Paul H. Law of Contract. 5th ed. Harlow, Essex: Longman, 2002.

MLA引文

Richards, Paul H. Law of Contract. 5th ed. Longman, 2002.

警告：这些引文格式不一定是100％准确.