Perry, Nick
Routledge Press , 1998
Buku Teks
Siagian, Henri Salomo, author
2015
UI - Tesis (Membership)
editor, Wiendu Nuryanti
Gadjah Mada University Press , 1996
Buku Referensi
Lechner, Frank J., author
Blackwell, 2005
Buku Teks
Kaplan, David, author
Pustaka Pelajar, 1999
Buku Teks