Philippines. National Mapping and Resource Information Authority. (1990). Province of Sorsogon (Ed 1, October, 1990.). National Mapping and Resource Information Authority.
Chicago Style (17th ed.) CitationPhilippines. National Mapping and Resource Information Authority. Province of Sorsogon. Ed 1, October, 1990. Makati, Metro Manila: National Mapping and Resource Information Authority, 1990.
MLA (9th ed.) CitationPhilippines. National Mapping and Resource Information Authority. Province of Sorsogon. Ed 1, October, 1990. National Mapping and Resource Information Authority, 1990.
Warning: These citations may not always be 100% accurate.