McIntyre, Lisa J., author
McGraw-Hill, 2008
Buku Teks
Sullivan, Thomas J., 1944-, author
John Wiley & Sons, 1984
Buku Teks
Harvey, Lee, author
Macmillan, 1993
Buku Teks
Schrag, Clarence C., author
Harper & Row, 1963
Buku Teks
Zanden, James W. Vander, author
John Wiley & Sons, 1979
Buku Teks