Ruggiero, V. R. (1995). The art of thinking: A guide to critical and creative thought (4th ed.). HarperCollins College Publishers.
Citace podle 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.
Citace podle MLA (9th ed.)Ruggiero, Vincent Ryan. The Art of Thinking: A Guide to Critical and Creative Thought. 4th ed. HarperCollins College Publishers, 1995.
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