Cita APA (7th ed.)

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.