Philippines (Republic). National Irrigation Administration & Philippines (Republic) Bureau of Agricultural Economics. (1971). Agronomic and economic correlation study, supporting activity for the land classification works, on the Upper Pampanga River Project, service area. [s.n.].
Citazione stile Chigago Style (17a edizione)Philippines (Republic). National Irrigation Administration e Philippines (Republic) Bureau of Agricultural Economics. Agronomic and Economic Correlation Study, Supporting Activity for the Land Classification Works, on the Upper Pampanga River Project, Service Area. Quezon City: [s.n.], 1971.
Citatione MLA (9a ed.)Philippines (Republic). National Irrigation Administration e Philippines (Republic) Bureau of Agricultural Economics. Agronomic and Economic Correlation Study, Supporting Activity for the Land Classification Works, on the Upper Pampanga River Project, Service Area. [s.n.], 1971.