Artikel Jurnal
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McGraw-Hill , 2009
Buku Teks
Scott, Michael J., author
Sage Publications, 2004
Buku Teks
Febry Sam, author
Universitas Indonesia, 2017
UI - Tesis (Membership)
Evi Sukmaningrum, author
Fakultas Psikologi Universitas Indonesia, 2004
UI - Tesis (Membership)