Shenkel, William M.
Business Publications , 1980
Buku Teks
editor, Joseph L. Pagliari
Irwin, 1996
Buku Referensi
Ario Pramadhi
2001
UI - Tesis (Membership)
Mosalina Dewi
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1996
UI - Tesis (Membership)
Kau, James B.
McGraw-Hill, 1985
Buku Teks