Daniel, Wayne W.
Houghton Miffiln, 1989
Buku Teks
Levin, Richard I.
Prentice-Hall, 1998
Buku Teks SO
Manly, Bryan F.J.
CRC Press, Taylor & Francis Group, 2009
Buku Teks
Chao, Lincoln L.
Prentice-Hall, 1981
Buku Teks
by Collin J. Watson [and others]
Allyn and Bacon, 1993
Buku Teks