Ahmad Muzayyin, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2018
UI - Skripsi (Membership)
Stern, Alfred
Arco Publishing, Inc., 1984
Buku Teks
Henderson, David, author
New Zealand Business Roundtable , 1998
Buku Teks
Wallace, Willard M., author
Harper &Brothers, 1954
Buku Teks
Webb, Michael, 1937-, author
Chronicle Books, 2002
Buku Teks