Sherington, Geoffrey
Allen and Unwin, 1990
Buku Teks SO
Dugan, Michael
Melbourne: The MAcmillian Company of Australia; 1984,
Buku Referensi
Lowenstein, Katharin Wendy
Hyland House Publishing , 1977
Buku Teks SO
editor, Joost Cote & Loes Westerbeek; penerjemah, Abdul Wachid
Syarikat Indonesia, 2004
Buku Teks
Azhrianka Dewi Putri Sudarmanto
2016
UI - Skripsi Membership