APA引文

Gemmill, P. F. (1942). Economics: Principles and problems. New York: Harper & Brothers Publishers.

Trích dẫn kiểu Chicago

Gemmill, Paul F. Economics: Principles and Problems. New York: Harper & Brothers Publishers, 1942.

MLA引文

Gemmill, Paul F. Economics: Principles and Problems. New York: Harper & Brothers Publishers, 1942.

警告：這些引文格式不一定是100％准確.