Cita APA (7th ed.)

(1955). Soil map: Abra Province, Philippines. Bureau of Soils.

Cita Chicago (17th ed.)

Soil Map: Abra Province, Philippines. Manila: Bureau of Soils, 1955.

Cita MLA (9th ed.)

Soil Map: Abra Province, Philippines. Bureau of Soils, 1955.