Little, Brown and Company , 1998
Buku Teks
Intan Sofyan
Fakultas Ilmu Administrasi Universitas Indonesia, 2021
UI - Skripsi (Membership)
essay by Dave Hickey, Peter Plagens
Hudson Hills Press, 1982
Buku Referensi
Richardson, Joanna
The British Council by Longmans, Green, 1960
Buku Teks
Walia, Shelley
Jendela, 2003
Buku Teks