Nanney, J. Louis, author
Allyn and Bacon, 1980
Buku Teks
Gager, William A., author
Macmillan, 1968
Buku Teks
Barnett, Raymond A., author
McGraw-Hill, 2001
Buku Teks
Barnett, Raymond A., author
McGraw-Hill, 2001
Buku Teks
White, Paul A., author
Dickenson, 1968
Buku Teks