Miller, E. Morris, author
Angus and Robertson, 1956
Buku Teks
University of Queensland Press, 1992
Buku Referensi
Hope, A.D., author
Oxford University Press, 1992
Buku Teks
Lock, Fred
Oxford University Press, 1977
Buku Referensi
Johnston, Grahame, author
Oxford University Press, 1970
Buku Teks