Gilman, Leonard
John Wiley & Sons, 1983
Buku Teks SO
Gilman, Leonard
John Wiley & Sons, 1976
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Gilman, Leonard
John Wiley & Sons, 1970
Buku Teks SO
Rubenfeld, M. Gaie
Lippincott , 1999
Buku Teks
Rusaw, A. Carol
Harcourt College Publishers, 2001
Buku Referensi