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McGraw-Hill, 2011
Buku Teks
Schultz, Richard, author
Prentice-Hall, 1999
Buku Teks
Wiley, 1992
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Metha Bhalkis Irianti, author
Fakultas Psikologi Universitas Indonesia, 2016
UI - Skripsi (Membership)
Smolak, Kenyon, author
Prentice-Hall, 1993
Buku Teks