edited by Ralf Schwarzer, Henk M. van der Ploeg and Charles D. Spielberger
Swetz & Zeitlinger, 1989
Buku Teks SO
Winda Sari Zikri
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 1995
UI - Tesis Membership
Asep Saepullah
2019
UI - Tesis Membership
Emerald Publishing Limited, 2020
eBooks
Kotler, Philip
Pearson, 2010
Buku Teks