APA引文

Roberts, P. D. (1987). Plan English a user's guide. USA: Penguin Books.

Trích dẫn kiểu Chicago

Roberts, Philip Davies. Plan English a User's Guide. USA: Penguin Books, 1987.

MLA引文

Roberts, Philip Davies. Plan English a User's Guide. USA: Penguin Books, 1987.

警告：這些引文格式不一定是100％准確.