Zimmerman, Neal, author
John Wiley & Sons, 1996
Buku Teks
Giddens, Anthony, author
W.W. Norton & Compan, 2005
Buku Teks
Getis, Arthur, author
McGraw-Hill Higher Education, 2009
Buku Teks
Mitchell, Laura, 1958-, author
Oxford University Press, 2007
Buku Teks
Griffiths, David J., author
Prentice-Hall, 1989
Buku Teks