Goldsmith, Seth B., author
An Aspen, 1981
Buku Teks
Sanders, Donald H., author
McGraw-Hill , 1974
Buku Teks
Edited by Tiziano Bonini, Belen Monclus
Routledge, 2015
Buku Teks
Castells, Manuel, author
Blackwell, 1998
Buku Teks
Castells, Manuel, author
Blackwell, 1997
Buku Teks