Stettner, Morey
McGraw-Hill, 2003
Buku Teks
Bittel, Lester Robert
McGraw-Hill, 1976
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Khaerul Umam Noer
Pustaka Setia, 2014
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Fitz-enz, Jac
McGraw-Hill , 1984
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Nundhini T. Astrie
Fakultas Psikologi Universitas Indonesia, 2005
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