Dobelstein, Andrew W.
Wadsworth, 2003
Buku Teks
Friedlander, Walter A.
Prentice Hall of India, 1982
Buku Teks
Timms, Rita
Routledge, 1982
Buku Referensi
Young, Pat
Macmillan, 1995
Buku Teks
Schneider, Jo Anne
Columbia University Press, 2006
Buku Teks