Cregier, Don M.
University Of Missouri Press, 1976
Buku Teks
Crisp, L. F. (Leslie Finlay)
Longman Chesire, 1965
Buku Teks
Crisp, L. F. (Leslie Finlay)
Longman, 1973
Buku Teks
edited by Henry Mayer
F.W. Chesire, 1966
Buku Teks
Aitkin, Don
Pitman, 1985
Buku Teks