Cita APA (7th ed.)

Sancianco, G. G., & Alzona, E. (1975). The progress of the Philippines. National Historical Institute.

Cita Chicago (17th ed.)

Sancianco, Gregorio G., i Encarnacion Alzona. The Progress of the Philippines. Manila: National Historical Institute, 1975.

Cita MLA (9th ed.)

Sancianco, Gregorio G., i Encarnacion Alzona. The Progress of the Philippines. National Historical Institute, 1975.