edited by Brian Towers
Kogan Page, 1993
Buku Teks
Manurung, Marina Margaretha, author
2016
UI - Skripsi Membership
Taylor, Benjamin J., author
Prentice-Hall, 1987
Buku Teks
Carrell, Michael R., author
Prentice-Hall, 2001
Buku Teks
Devinka Adira, author
Universitas Indonesia, 2018
UI - Skripsi Membership