Miller, Delbert C., author
Longman, 1983
Buku Teks
Viswanathan, Madhu, author
SAGE Publ., 2005
Buku Teks
edited by Ann Bowling, Shah Ebrahim
Open University Press, 2007
Buku Teks
Richard G. Seymour, editor
Edward Elgar, 2012
Buku Teks
Thyer, Bruce A.
London : Sage Publications, 2001,
Buku Referensi