Zwerman, William L
Greenwood Publishing Corporation, 1970
Buku Teks
Allen, Louis A., author
McGraw-Hill Kogakusha, 1958
Buku Teks
Church, Jeffrey, author
McGraw-Hill, 2000
Buku Teks
Pepall, Lynne, author
Thomson , 2005
Buku Teks
Lawrence, Paul R., author
Graduate School of Business Administration, Harvard University, 1967
Buku Teks