Larsson, Christofer, author
Academic Press, 2014
eBooks
Rogers, Everett M., author
The Free Press, 1981
Buku Teks
Rao, K.R., author
Pearson Prentice Hall, 2002
Buku Teks
Mulgan, G.J. (Geoffrey J.)
Polity Press , 1991
Buku Teks
edited by Peggy Simcic Brønn, Stefania Romenti, Ansgar Zerfass
Emerald, 2016
eBooks