Cita APA (7th ed.)

(1970). Population density by province 1970: Mindanao. s.n.].

Cita Chicago (17th ed.)

Population Density by Province 1970: Mindanao. [Manila: s.n.], 1970.

Cita MLA (9th ed.)

Population Density by Province 1970: Mindanao. s.n.], 1970.