Gilbert, Neil, author
Allyn and Bacon, 1998
Buku Teks
Gilbert, Neil, author
Prentice-Hall, 1974
Buku Teks
National conference on social welfare
Columbia University Press, 1974
Buku Teks
National Conference on Social Welfare
Columbia University Press, 1961
Buku Teks
Cunningham, Jo, author
Learning Matters, 2008
Buku Teks