Lewis, Harold Maclean
John Wiley & Sons, 1957
Buku Teks
American Planning Association ; editor, Frederick R. Steiner, Kent Butler
John Wiley & Sons, 2007
Buku Teks
Blackwell Publishing, 2003
Buku Teks
Brown, A.J., author
Melbourne University Press, 1951
Buku Teks
Gillie, F.B., author
The Hague, 1971
Buku Teks