Gore, M.S., author
Asia Publishing House, 1965
Buku Teks
Dubois, Brenda, 1949-, author
Allyn and Boston, 1992
Buku Teks
edited by Robert H. Beck
National Association of Social Workers, 1965
Buku Teks
Heraud, Brian J., author
Routledge & Kegan Paul , 1981
Buku Teks
Cohen, Nathan Edward, author
National Ass. of Workker, 1964
Buku Teks