APA引文

Wykstra, R. A. (1971). Introductory Economics. New York: Harper & Row.

Trích dẫn kiểu Chicago

Wykstra, Ronald A. Introductory Economics. New York: Harper & Row, 1971.

MLA引文

Wykstra, Ronald A. Introductory Economics. New York: Harper & Row, 1971.

警告：這些引文格式不一定是100％准確.