Osit, Michael, author
American Management Association, 2008
eBooks
Isa Nuruddin Ahmad, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2014
UI - Makalah dan Kertas Kerja
Boog, Jason, author
NY : A Touchstone Book, Published by Simon & Schuster, 2014
Buku Teks
De Mente, Boye, author
Passport Books, 1992
Buku Referensi
Bohang, Lala, author
Gramedia Pusaka Utama, 2023
Buku Teks