Megginson, William L, Mary Jane Byrd, Charles R. Scott, Leon C. Megginson
Irwin, 1997
Buku Referensi
Megginson, William L., author
McGraw-Hill, 2000
Buku Referensi
Byrd, Mary Jane
mcGraw-Hill , 2000
Multimedia
Timmons, Jeffry A
McGraw-Hill, 204
Buku Teks
Hodgetts, Richard M., author
Harcourt College Publishers, 2001
Buku Teks