Isaacs, Asher, 1902-1963, author
Dryden Press, 1952
Buku Teks
Lindauer, John, author
Saunders , 1977
Buku Teks
McKenzie, Richard B., author
McGraw-Hill, 1978
Buku Teks
Brown, A.J., author
George Allen & Unwin, 1951
Buku Teks
Meyers, Albert, author
Prentice-Hall, 1956
Buku Teks