Sharp, Ilsa
Oxford University Press, 1997
Buku Referensi
Brar, Karanjot Kaur
Dominant Publishers & Distributors, 1999
Buku Teks
Hopfenbeck, Waldemar
[publisher not identified], [date of publication no identified]
Buku Teks
Matson, Pamela A., editor
Island Press, 2012
eBooks
Kahin, George McTurnan
Cornell University Press, 1952
Buku Teks