APA (7th ed.) Citation

Pena, N. (1977). Philippine law on natural resources (Rev. ed.). Rex Book Store.

Chicago Style (17th ed.) Citation

Pena, Narciso. Philippine Law on Natural Resources. Rev. ed. Manila: Rex Book Store, 1977.

MLA (9th ed.) Citation

Pena, Narciso. Philippine Law on Natural Resources. Rev. ed. Rex Book Store, 1977.