(1972). Population map 1970: Cities and municipalities, Bicol region. [s.n.].
Chicago Style (17th ed.) CitationPopulation Map 1970: Cities and Municipalities, Bicol Region. [Manila]: [s.n.], 1972.
MLA引文Population Map 1970: Cities and Municipalities, Bicol Region. [s.n.], 1972.
警告:這些引文格式不一定是100%准確.