English, James, author
McGraw-Hill, 1956
Buku Teks
Griffin, Rodger W., author
McGraw-Hill, 1969
Buku Teks
Ouellette, Robert J., author
Prentice-Hall, 1994
Buku Teks
Brown, William H., author
Saunders College, 1997
Buku Teks
McMurry, John, author
Brooks/Cole Pub., 1994
Buku Teks