Lipset, Seymour Martin, author
University of California, 1967
Buku Teks
edited by Arthur Cotterell
Oxford Oxford University Press , 1980
Buku Teks
Kumar, Krishan, author
Blackwell, 1996
Buku Teks
edited by M. David Ermann and Richard J. Lundman
Oxford University Press, 1978
Buku Teks
Konrad Adenauer Stiftung (Yayasan Konrad Adenauer), 2004
Buku Teks