Ruggiero, V. R. (2001). The art of thinking: A guide to critical and creative thought (6th ed.). Longman.
Chicago-čujuhus (17. p.)Ruggiero, Vincent R. The Art of Thinking: A Guide to Critical and Creative Thought. 6th ed. New York: Longman, 2001.
MLA-čujuhus (9. p.)Ruggiero, Vincent R. The Art of Thinking: A Guide to Critical and Creative Thought. 6th ed. Longman, 2001.
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