Lynn, Adele B., author
American Management Association, 2002
eBooks
He, Baogang, 1957-, author
World Scientific Publishing , 2017
Buku Teks
Boldrewood, Rolf
Currey O'Nei, 1984
Buku Teks
Fathia Az'Zahra, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2019
UI - Skripsi (Membership)
Marcella, Rita, author
Gower ; Jaico Publishing House,
Buku Referensi