Hallahan, Daniel P., author
Prentice-Hall, 1988
Buku Teks
Department of Health, education and welfare, 1964
Buku Teks
Glazer, Nathan, author
Change Magazine Press, 1977
Buku Teks
Department of Health , 1977
Buku Teks
Regan, William
Harper & Row, Publishers, 1970
Buku Teks