Não informado. Progress Report of the Land Resources Division. Ministry of Overseas Development.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Progress Report of the Land Resources Division. Surbiton, Inglaterra: Ministry of Overseas Development.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Progress Report of the Land Resources Division. Ministry of Overseas Development.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.