edited by Heidi Keller, Ype H. Poortinga and Axel Scholmerich
Cambridge, 2002
Buku Teks
Wei-Shou Hu, author
Springer, 2012
eBooks
Artikel Jurnal
edited by Lucian W. Pye and Sidney Verba
Princeton University Press , 1965
Buku Teks
Lechner, Frank J., author
Blackwell, 2005
Buku Teks