Blau, Peter M., author
John Wiley & Sons, 1964
Buku Teks
Lentner, Howard H., author
Routledge, 2004
Buku Teks
edited by Enrico Fels, Jan-Frederik Kremer, Katharina Kronenberg
Springer, 2012
eBooks
Levine, Daniel U.
Allyn and Bacon, 1992
Buku Teks
edited by Anthony Giddens and David Held
Macmillan, 1992
Buku Teks