Sherington, Geoffrey, author
George Allen and Unwin, 1982
Buku Teks
Sherington, Geoffrey, author
Allen and Unwin, 1990
Buku Teks
Dugan, Michael, author
Melbourne: The MAcmillian Company of Australia; 1984,
Buku Referensi
Lowenstein, Katharin Wendy, author
Hyland House Publishing , 1977
Buku Teks
Syarikat Indonesia, 2004
Buku Teks