Hill, N. (1977). Success through a positive mental attitude. A Kangaroo book.
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Dyfyniad Arddull Chicago
Hill, Napoleon. Success Through a Positive Mental Attitude. New York: A Kangaroo book, 1977.
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Dyfyniad MLA
Hill, Napoleon. Success Through a Positive Mental Attitude. A Kangaroo book, 1977.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.