APA引文

(1972). Population and heirarchy of cities and municipalities: Bicol region. [s.n.].

Chicago Style (17th ed.) Citation

Population and Heirarchy of Cities and Municipalities: Bicol Region. [Manila]: [s.n.], 1972.

MLA引文

Population and Heirarchy of Cities and Municipalities: Bicol Region. [s.n.], 1972.

警告：這些引文格式不一定是100％准確.