Cita APA (7th ed.)

Ruggiero, V. R. (1995). The art of thinking: A guide to critical and creative thought (4th ed.). HarperCollins College Publishers.

Cita Chicago (17th ed.)

Ruggiero, Vincent Ryan. The Art of Thinking: A Guide to Critical and Creative Thought. 4th ed. New York: HarperCollins College Publishers, 1995.

Cita MLA (9th ed.)

Ruggiero, Vincent Ryan. The Art of Thinking: A Guide to Critical and Creative Thought. 4th ed. HarperCollins College Publishers, 1995.