Philippines. National Economic Development Authority. (1975). Development in Region I: An annotated bibliography. National Economic Development Authority.
Chicago-referens (17:e uppl.)Philippines. National Economic Development Authority. Development in Region I: An Annotated Bibliography. [San Fernando, La Union]: National Economic Development Authority, 1975.
MLA-referens (9:e uppl.)Philippines. National Economic Development Authority. Development in Region I: An Annotated Bibliography. National Economic Development Authority, 1975.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.