edited by Robert R. Lewis
Prentice-Hall, 1981
Buku Teks
Retno Lusi Anggari, author
Program Pascasarjana Universitas Indonesia, 2003
UI - Tesis (Membership)
Scanzoni, Letha Dawson
McGraw-Hill, 1981
Buku Teks
Powell, Gary N.
Sage Publications, 1988
Buku Teks
Sembiring Pandia, Weny Savitri, author
1997
UI - Skripsi (Membership)