Não informado. Oil Palm News. Tropical Products Institute, Oil Palm Advisory Bureau.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Oil Palm News. London: Tropical Products Institute, Oil Palm Advisory Bureau.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Oil Palm News. Tropical Products Institute, Oil Palm Advisory Bureau.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.