Mille, G. Tyler
Brooks/Cole, Cengage Learning,, 2010
Buku Teks
edited by W. Schroder [and others]
Ernst & Sohn , 1996
Buku Teks
Tuan, Yi-fu
Columbia University, 1990
Buku Teks
Kaufman, Robert K., author
McGraw-Hill, 2008
Buku Teks
Kemp, David D., author
Routledge , 1994
Buku Teks