Bernal, R., & Echevarria, R. (1967). Prologue to Philippine history. Solidaridad Pub. House.
Cita Chicago (17th ed.)Bernal, Rafael, i Ramon Echevarria. Prologue to Philippine History. Manila: Solidaridad Pub. House, 1967.
Cita MLA (9th ed.)Bernal, Rafael, i Ramon Echevarria. Prologue to Philippine History. Solidaridad Pub. House, 1967.
Atenció: Aquestes cites poden no estar 100% correctes.