Cita APA (7th ed.)

Ruggiero, V. R. (2001). The art of thinking: A guide to critical and creative thought (6th ed.). Longman.

Cita Chicago (17th ed.)

Ruggiero, Vincent R. The Art of Thinking: A Guide to Critical and Creative Thought. 6th ed. New York: Longman, 2001.

Cita MLA (9th ed.)

Ruggiero, Vincent R. The Art of Thinking: A Guide to Critical and Creative Thought. 6th ed. Longman, 2001.