Não informado. (1987). Nigerian Journal of Palms and Oil Seeds. Nigerian Institute for Oil Palm Research.
Chicago-referens (17:e uppl.)Não informado. Nigerian Journal of Palms and Oil Seeds. Benin City, Nigeria: Nigerian Institute for Oil Palm Research, 1987.
MLA-referens (8:e uppl.)Não informado. Nigerian Journal of Palms and Oil Seeds. Nigerian Institute for Oil Palm Research, 1987.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.