Smyth, Terry, author
Macmillan, 1996
Buku Teks
Bond, Meg, author
McGraw-Hill, 2010
Buku Teks
Metzger, Norman, author
Aspen Publication, 1983
Buku Teks
United Nations Centre for Human Settlements (Habitat), 1991
Buku Referensi
Davies, David B., author
McGraw-Hill, 1985
Buku Teks