Não informado. (1981). Health technology directions. Program for Appropriate Technology.
Chicago-referens (17:e uppl.)Não informado. Health Technology Directions. Seattle, Wash: Program for Appropriate Technology, 1981.
MLA-referens (8:e uppl.)Não informado. Health Technology Directions. Program for Appropriate Technology, 1981.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.