Gallinger, George W., author
Massachusetts Addison-Wesley Publishing Co., 1991
Buku Teks
Gallinger, George W., author
Mass. Addison-Wesley , 1987
Buku Teks
Elfram Gomgom, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2013
UI - Tesis Membership
Block, Stanley B., author
Japan Toppan, 1990
Buku Teks
Higgins, Robert C., author
McGraw-Hill, 2000
Buku Teks