Nehr, Lee Charles, author
Intext Educational, 1972
Buku Teks
Baker, James C., author
Prentice-Hall, 1998
Buku Teks
Evans, John S.
Dryden Press , 1992
Buku Teks
Kolb Publishing Company , 1993
Buku Teks
Levi, Maurice D., 1945-, author
Andi, 2001
Buku Teks