Byman, Daniel, author
Cambridge University Press, 2007
Buku Teks
Gultom, Leonardis Arthur Parlindungan, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2014
UI - Tesis (Membership)
Kotler
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Armstrong, David, 1960-, author
Steerforth Press, 2007
Buku Teks
Stine, R.L, author
Gramedia Pustaka Utama, 2003
Buku Teks