Rosenthal, M. Sara, author
Contemporary Books, 2001
Buku Teks
Warhus, Susan, author
McGraw-Hill, 2007
Buku Teks
Young, Bruce K., author
Bantam Dell, 2008
Buku Teks
Pickering, Thomas
Fireside, 1997
Buku Teks
Weinstein, David A., author
John Wiley & Sons, 1987
Buku Teks