Chruden, Herbert J.
South-Western Publishing Co., 1976
Buku Teks
Chruden, Herbert J.
South-Western , 1966
Buku Teks
Jucius, Michael J.
Chicago, Ill Richard D. Irwin. Inc , 1949
Buku Teks
Irwin, 1989
Buku Teks
Flippo, Edwin B., author
McGraw-Hill, 1984
Buku Teks