Wekerle, Gerda R., author
Van Nostrand Reinhold, 1995
Buku Teks
Pitts, Robert A., author
South-Western College Publishing, 2000
Buku Teks
Summers, Donna C. S., author
Pearson/Prentice Hall, 2005
Buku Teks
Buku Teks
Bryson, John M., author
Jossey-Bass, 2011
Buku Teks