Barnum, Barbara Stevens, author
An Aspen, 1995
Buku Teks
Swansburg, Russell C., author
Jones and Bartlett, 1999
Buku Teks
Swansburg, Russell C., author
Jones and Bartlett, 1999
Buku Teks
Oop Ropei, author
2010
UI - Tesis (Open)
Mohd. Syukri, author
Universitas Indonesia, 2013
UI - Tesis (Membership)