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2Cyhoeddwyd 1976“...Holt, Rinehart and Winston,...”
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8gan Allport, Gordon W. (Gordon Willard), 1897-1967“...Holt, Rinehart and Winston,...”
Cyhoeddwyd 1963
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12gan Kerlinger, Fred N. (Frederick Nichols), 1910-“...Holt, Rinehart and Winston,...”
Cyhoeddwyd 1986
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