Reichmann, W.J.
Oxfrod University Press ., 1962
Buku Teks
Bell, Philip A., author
ABS Catalogue, 1999
Buku Referensi
Blyth, Conrad Alexander
Allen & Unwin, 1966
Buku Teks
McClave, James T., author
Dellen Publishing, 1979
Buku Teks
Hays, William L., author
Harcourt Brace Colege, 1994
Buku Teks