Barnett, Nancy Smith, author
Prentice-Hall, 1972
Buku Teks
Vane, Howard R., author
Harvester Wheatsheaf , 1989
Buku Teks
Vane, Howard R., author
Harvester Wheatsheaf , 1993
Buku Teks
Culbertson, John M., author
McGraw-Hill, 1968
Buku Teks
Branson, William H., author
Harper & Row, 1979
Buku Teks