Klenk, Robert W
Wadsworth, 1970
Buku Teks
Klenk, Robert W.
Wadsworth, 1974
Buku Teks
National Association of Social of social Workers, 1980
Buku Teks
Hancock, Betsy Ledbetter, author
Prentice-Hall, 1982
Buku Teks
Ife, Jim, 1946-, author
Longman, 1997
Buku Teks