Bode, Boyd Henry
D.C Heath and Company, 1940
Buku Teks
Pagel, J.F., author
Academic Press, 2014
eBooks
Sexton, John, author
M. Evans and Company, 1986
Buku Teks
Young, Dennis
The Urban Institute , 1972
Buku Teks
Albright, Madeleine, author
Harper Perenial, 2008
Buku Teks