Não informado. (2000). University of California publications in public health. University of California.
Chicago-referens (17:e uppl.)Não informado. University of California Publications in Public Health. Berkeley, Calif: University of California, 2000.
MLA-referens (8:e uppl.)Não informado. University of California Publications in Public Health. University of California, 2000.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.