Rockport Publisher, 2001
Buku Teks
Henderson, Justin
Hi Marketing, 2001
Buku Teks
Fakultas Psikologi Universitas Indonesia, 1993
UI - Skripsi (Membership)
Gomez-Palacio, Bryony
Page one publishing pte ltd, 2009
Buku Referensi
Eskilson, Stephen
Laurence King , 2012
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