APA (7th ed.) Citation

Blumenthal. (1985). The art of letter writing. The Putnam Publishing Group.

Chicago Style (17th ed.) Citation

Blumenthal. The Art of Letter Writing. New York: The Putnam Publishing Group, 1985.

MLA (9th ed.) Citation

Blumenthal. The Art of Letter Writing. The Putnam Publishing Group, 1985.

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