Sawyer, Deborah F, author
Routledge, 1996
Buku Teks
Tanasale, Helena, author
Program Pascasarjana Universitas Indonesia, 2003
UI - Tesis (Membership)
Sales, Rosemary
Routledge, 1997
Buku Teks
Terence Lovat, editor
Springer, 2012
eBooks
Mary Bryden
Routledge, 2001
Buku Teks