Não informado. Western horizons. National Drug and Chemical Corporation of Canada.
Chicago-referens (17:e uppl.)Não informado. Western Horizons. Winnipeg, Canada: National Drug and Chemical Corporation of Canada.
MLA-referens (8:e uppl.)Não informado. Western Horizons. National Drug and Chemical Corporation of Canada.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.