Legaspi City Development Council. Development Planning Division. Economic profile, 1973. [s.n.
Cita Chicago (17th ed.)Legaspi City Development Council. Development Planning Division. Economic Profile, 1973. Legaspi City: [s.n.
Cita MLA (9th ed.)Legaspi City Development Council. Development Planning Division. Economic Profile, 1973. [s.n.
Atenció: Aquestes cites poden no estar 100% correctes.