Healy, Karen, author
Palgrave Macmillan, 2005
Buku Teks
edited by Jerrold R. Brandell
Free Press, 1997
Buku Teks
Miley, Karla Krogsrud, 1942-, author
Pearson, 2014
Buku Teks
Cohen, Nathan Edward, author
National Ass. of Workker, 1964
Buku Teks
edited by Jan Fook
Allen & Unwin, 1996
Buku Teks