(1972). Population and heirarchy of cities and municipalities: Bicol region. [s.n.].
Chicagoスタイル(17版)引用形式Population and Heirarchy of Cities and Municipalities: Bicol Region. [Manila]: [s.n.], 1972.
MLA(9版)引用形式Population and Heirarchy of Cities and Municipalities: Bicol Region. [s.n.], 1972.
警告: この引用は必ずしも正確ではありません.