Ward, John M., author
Melbourne University Press, 1958
Buku Teks
Cregier, Don M.
University Of Missouri Press, 1976
Buku Teks
Crisp, L. F. (Leslie Finlay), author
Longman Chesire, 1965
Buku Teks
Crisp, L. F. (Leslie Finlay), author
Longman, 1973
Buku Teks
edited by Henry Mayer
F.W. Chesire, 1966
Buku Teks