Bauer, Heinz, author
Academic Press, 1981
Buku Teks
Roberts, Richard A., 1935-, author
Massachusetts Addison-Wesley, 1992
Buku Teks
Ross, Sheldon
Macmillan, 1984
Buku Teks
Fine, Terrence L., atuhor
Pearson Prentice Hall, 2006
Buku Teks
Rowbottom, Darrell P., 1975-, author
Polity Press, 2015
Buku Teks