Drummond, Michael F., author
Oxford University Press, 1981
Buku Teks
Drummond, Michael F., author
Oxford University Press, 1989
Buku Teks
Drummond, Michael F., author
Oxford Univesity Press, 1980
Buku Teks
Adler, Hans A., author
Indiana University Press, 1971
Buku Teks
McConnell, Charles R., author
Jones and Bartlett, 2011
Buku Teks