(1972). Area of influences: Road network of the Bicol region. [s.n.].
Citación estilo ChicagoArea of Influences: Road Network of the Bicol Region. [Manila]: [s.n.], 1972.
Cita MLAArea of Influences: Road Network of the Bicol Region. [s.n.], 1972.
Warning: These citations may not always be 100% accurate.