Harmon, Paul, author
Elsevier, 2014
eBooks
edited by Stephen Clarke
Harper Collins, 1992
Buku Referensi
Bailey, Edward P., author
Prentice-Hall, 2002
Buku Teks
Paulson, Edward, author
Prenada Media, 2003
Buku Teks
Mattel, Bruce, author
John Wiley & Sons, 2008
Buku Teks