Purwantoro, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2016
UI - Tesis (Membership)
Irwin, Penny
Churchill Livingstone, 1995
Buku Referensi
edited by Paul M. Wortman
Sage, 1981
Buku Teks
Veney, James E., author
Prentice-Hall, 1989
Buku Teks
edited by Richard H. Egdahl
Springer-Verlag, 1977
Buku Teks