Guth, H. P. (1969). Essay (Second edition.). Belmont, California: Wadsworth Publishing Company.
Trích dẫn kiểu ChicagoGuth, Hans P. Essay. Second edition. Belmont, California: Wadsworth Publishing Company, 1969.
Deismireacht MLAGuth, Hans P. Essay. Second edition. Belmont, California: Wadsworth Publishing Company, 1969.
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