Cita APA (7a ed.)

Flesch, R. (1973). The Art of Clear Thinking. Barnes & Noble Books.

Cita Chicago Style (17a ed.)

Flesch, Rudolf. The Art of Clear Thinking. New York [etc.]: Barnes & Noble Books, 1973.

Cita MLA (9a ed.)

Flesch, Rudolf. The Art of Clear Thinking. Barnes & Noble Books, 1973.