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