(1972). Population and heirarchy of cities and municipalities: Bicol region. [s.n.].
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPopulation and Heirarchy of Cities and Municipalities: Bicol Region. [Manila]: [s.n.], 1972.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPopulation and Heirarchy of Cities and Municipalities: Bicol Region. [s.n.], 1972.
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