APA引文

Keenan, D., & Business Contract. (2007). Business law (8h ed.).

芝加哥风格引文

Keenan, Denis, 与 Business Contract. Business Law. 8h ed. 2007.

MLA引文

Keenan, Denis, 与 Business Contract. Business Law. 8h ed. 2007.

警告：这些引文格式不一定是100％准确.