Holland, Patricia, author
Routledge, 1997
Buku Referensi
Ward, Peter, author
Focal Press, 2000
Buku Referensi
Bartlett, Eugene R., author
McGraw-Hill, 2000
Buku Referensi
Lenk, John D., author
McGraw-Hill, 1994
Buku Referensi
edited by Melissa A. Redford
Wiley Blackwell, 2015
Buku Teks