Wasserman, Barry, author
John Wiley & Sons, 2000
Buku Teks
Thiroux, Jacques P. author
Pearson, 2015
Buku Teks
Foster, Illysa R., author
Jones & Bartlett Learning, 2011
Buku Teks
Cambridge University Press, 2015
Buku Teks
edited by Christopher Dowrick and Lucy Frith
Routledge, 1999
Buku Teks