Potter, Norman N.
Avi Pub., 1973
Buku Teks SO
Y.H. Hui, editor-in-chief
Wiley, 1992
Buku Referensi
edited by Muhammad Ashraf
Springer, 2012
eBooks
Ahmad Arief Yudansha
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2017
UI - Tesis Membership
Anna McElhatton, editor
Springer, 2012
eBooks