Neuman, Lawrence W.
Pearson New International edition, 2014
Buku Teks
edited by Philip R. Cateora and Lee Richardson
Appleton-Century-Crofts, 1967
Buku Teks
Napitupulu, Richard Bonardo
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2019
UI - Tesis (Membership)
Neuman, William Lawrence, 1950-
Allyn and Bacon, 2003
Buku Teks
Punch, Keith F.
SAGE Publications, 1998
Buku Teks