Nellen, Annette, author
Prentice-Hall, 1999
Buku Teks
Tesser, Ted, author
John Wiley & Sons, 2000
Buku Teks
Williams, David, author
Sweet & Makwell, 2000
Buku Teks
Tillinghast, David R., author
Matthew Bender, 1984
Buku Teks
N.Y. AMA , 1982
Buku Teks