Não informado. (2001). Annual report of the Bureau of Science, Philippine Islands. Bureau of Science.
Chicago-referens (17:e uppl.)Não informado. Annual Report of the Bureau of Science, Philippine Islands. Manila: Bureau of Science, 2001.
MLA-referens (8:e uppl.)Não informado. Annual Report of the Bureau of Science, Philippine Islands. Bureau of Science, 2001.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.