Não informado. Oil Palm News. Tropical Products Institute, Oil Palm Advisory Bureau.
Chicago-referens (17:e uppl.)Não informado. Oil Palm News. London: Tropical Products Institute, Oil Palm Advisory Bureau.
MLA-referens (8:e uppl.)Não informado. Oil Palm News. Tropical Products Institute, Oil Palm Advisory Bureau.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.