Richard G. Seymour, editor
Edward Elgar, 2012
Buku Teks
Corbetta, Piergiorgio, author
Sage Publications , 2003
Buku Teks
Berg, Bruce L. (Bruce Lawrence), 1954-, author
Pearson, 2004
Buku Teks
May, Tim, author
Open University Press, 2001
Buku Teks
Thyer, Bruce A.
London : Sage Publications, 2001,
Buku Referensi