Renner, John W., author
Harper & Row, 1968
Buku Teks
Robinson, James T.
Wadsworth, 1968
Buku Teks
Friedl, Alfred E, author
McGraw-Hill, 2001
Buku Teks
Abruscato, Joseph, author
Allyn and Bacon, 2010
Buku Teks
Friedl, Alfred E., author
McGraw-Hill, 2001
Buku Teks