Merriam, C. W.
McGraw-Hill, 1964
Buku Teks
Hostetter, Gene H., 1939-, author
Saunders College Publishing, 1989
Buku Teks
DiStefano, Joseph J., 1940-, author
McGraw-Hill, 1983
Buku Teks
McDonald, A. C.
Reston Publishing Co., 1981
Buku Teks
DiStefano, Joseph J., 1940-, author
McGraw-Hill, 1983
Buku Teks