Thomas N. Ingram...[et al.]
Harcourt College Publishers, 2001
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Ford, Jo Ann Garofalo
Mosby, 1979
Buku Teks SO
edited by Randy Y. Hirokawa and Marshall Scott Poole
Sage, 1986
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Bunn, Derek W.
McGraw-Hill, 1984
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edited by Elena Tanfani and Angela Testi
Springer, 2012
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