Citazione Stile APA (7a Edizione)

Ruggiero, V. R. (1998). The art of thinking: A guide to critical and creative thought (5th ed.). Longman.

Citazione stile Chigago Style (17a edizione)

Ruggiero, Vincent Ryan. The Art of Thinking: A Guide to Critical and Creative Thought. 5th ed. New York: Longman, 1998.

Citatione MLA (9a ed.)

Ruggiero, Vincent Ryan. The Art of Thinking: A Guide to Critical and Creative Thought. 5th ed. Longman, 1998.