United States Agency for International Development (A.I.D.). Strategy guide for water management on small farms. USAID.
Chicago-referens (17:e uppl.)United States Agency for International Development (A.I.D.). Strategy Guide for Water Management on Small Farms. U.S.A: USAID.
MLA-referens (9:e uppl.)United States Agency for International Development (A.I.D.). Strategy Guide for Water Management on Small Farms. USAID.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.