Edey, Harold C.
Hutchinson's University Library , 1973
Buku Teks
Dickinson, John P., author
Philip Allan , 1990
Buku Teks
Stickney, Clyde P., author
Harcourt Brace Jovanovich, 1991
Buku Teks
Edwards, J. R
Paul Chapman Publishing, Ltd., 1989
Buku Teks
Lee, Nanci
Dryden Press , 1989
Buku Teks