APA aipamena

Buckley, E. A. (1961). How to increase sales with letters. McGraw Hill book company.

Chicago Style aipamena

Buckley, Earle A. How to Increase Sales with Letters. New York: McGraw Hill book company, 1961.

MLA aipamena

Buckley, Earle A. How to Increase Sales with Letters. McGraw Hill book company, 1961.