North Caroline , 1985
Buku Teks
Earnshaw, Rae A., author
Springer-Verlag, 1992
Buku Referensi
Widodo, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2005
UI - Tesis (Membership)
Schroeder, Larry D., author
Sage Publications, 1998
Buku Teks
Morris, Stephen, author
Prentice-Hall, 1998
Buku Teks