Druckman, Daniel, author
Sage Publications, 2005
Buku Teks
Ledin, Per, author
Sage, 2018
Buku Teks
Carver, Robert H., author
Brooks/Cole Cengage Learning, 2012
Buku Teks
Harris, Daniel C.
W H Freeman, 1991
Buku Teks
Daniel, Wayne W., author
John Wiley & Sons, 1983
Buku Teks