Wileman, R. E. (1980). Exercises in visual thinking. Hastings House Publishers.
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Dyfyniad Arddull Chicago
Wileman, Ralph E. Exercises in Visual Thinking. New York: Hastings House Publishers, 1980.
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Dyfyniad MLA
Wileman, Ralph E. Exercises in Visual Thinking. Hastings House Publishers, 1980.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.