Scott, Claudia Devita
The Urban Institute, 1972
Buku Teks
Tomkinson, Ray, author
Routledge, 2016
eBooks
Haynes, Robert J.
George Allen and Unwin, 1980
Buku Teks
Larcombe, Frederick Arthur, author
Sydney University Press, 1973
Buku Teks
Gustafsson, Agne
Swedish Institute, 1983
Buku Teks