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Buku Teks
Fogler, H. Scott, author
Prentice-Hall, 2008
Buku Teks
Starko, Alane Jordan, author
Lawrence Erlbaum Associates, 2005
Buku Teks
Thatchenkery, Tojo, author
Berrett-Koehler, 2006
Buku Teks
Titis Endarwidiarti, author
Fakultas Psikologi Universitas Indonesia, 2004
UI - Skripsi (Membership)