Não informado. (2001). Annual report of the Bureau of Science, Philippine Islands. Bureau of Science.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Annual Report of the Bureau of Science, Philippine Islands. Manila: Bureau of Science, 2001.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Annual Report of the Bureau of Science, Philippine Islands. Bureau of Science, 2001.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.