Semmler, Clement, editor
Longman Group, 1969
Buku Teks
Semmler, Clement, editor
Oxford University Press, 1972
Buku Teks
Buku Teks
Semmler, Clement, editor
University of Queensland Press [distributed by International Scholarly Book Services, 1972
Buku Teks
Greenlees, Ian
Longman Group, 1971
Buku Teks