APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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

Warning: These citations may not always be 100% accurate.