North, Alfred J.
Oxford University Press, 1984
Buku Referensi
Ledy Chyntya Anggreini, author
2015
UI - Tesis (Membership)
Robson, Lloyd, author
Oxford University Press, 1983
Buku Teks
Canberra Australia Government Publishing Service 1988,
Buku Teks
Miller, Edmun Morris
Sydney University Press, 1973
Buku Teks