Bretschneider, Franklin, author
Elsevier, 2006
Buku Teks
Elsevier, 2013
eBooks
Fletcher, Glenn, author
Wm. C. Brown, 1994
Buku Teks
Atkinson, Laurence V., author
Addison-Wesley, 1983
Buku Teks
Wiersma, William, author
Pearson/Allyn and Bacon, 2005
Buku Teks