Barker, Carol, author
Sage Publications, 1996
Buku Teks
edited by Joseph M. Kasonde, John D. Martin
World Health Organization, 1994
Buku Teks
edited by Kathleen Kelly
Mosby, 1994
Buku Teks
Morgan, Lynn Marie
Cambridge University Press, 1993
Buku Teks
Blum, Hendrik L.
Thirth Party, 1983
Buku Teks