Gavin, Helen
Sage, 2019
Buku Teks
Jack Kitaeff, editor
Routledge, 2011
Buku Teks
Grover Maurice Godwin, editor
CRC press, 2001
Buku Teks
Wrightsman, Lawrence S.
Wadsworth/Thomson Learning, 2001
Buku Teks
Santrock, John W.
McGraw-Hill, 2003
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