Não informado. (1996). Agriculture and environment for developing regions. Royal Tropical Institute.
Chicago-referens (17:e uppl.)Não informado. Agriculture and Environment for Developing Regions. Amsterdam: Royal Tropical Institute, 1996.
MLA-referens (8:e uppl.)Não informado. Agriculture and Environment for Developing Regions. Royal Tropical Institute, 1996.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.