APA استشهاد

Buckley, E. A. (1957). How to write better business letters/4e (4th ed.). McGraw Hill.

استشهاد بنمط شيكاغو

Buckley, Earl A. How to Write Better Business Letters/4e. 4th ed. New York: McGraw Hill, 1957.

MLA استشهاد

Buckley, Earl A. How to Write Better Business Letters/4e. 4th ed. McGraw Hill, 1957.