Routledge & Kegan Paul LTD, 1962
Buku Teks
Meyers, Fred E., author
Prentice-Hall, c1992
Buku Teks
Grant, Jim
Routledge, 2002
Buku Teks
Gherardi, Silvia, author
Northampton, MA : Edward Elgar, 2012
Buku Teks
Le Roy, Michael K., author
Wadsworth, 2009
Buku Teks