Ollif, Lorna
Twayne, 1971
Buku Teks
Semmler, Clement, editor
Longman Group, 1969
Buku Teks
Semmler, Clement, editor
Twayne Publishers, 1974
Buku Teks
Matthews, Brian
Melbourne University, 1972
Buku Teks
Semmler, Clement, editor
University of Queensland Press [distributed by International Scholarly Book Services, 1972
Buku Teks