Heldman, Robert K., author
McGraw-Hill , 1994
Buku Teks
Heldman, Robert K., author
D. C. McGraw-Hill , 1993
Buku Teks
Easley, David, author
Cambridge University Press, 2018
Buku Teks
Terranova, Tiziana, author
Pluto Press, 2005
Buku Teks
Castells, Manuel, author
Blackwell, 1998
Buku Teks