Zafra, N. 1. (1967). Philippine history through selected sources. Alemar-Phoenix Pub. House.
Chicago-referens (17:e uppl.)Zafra, Nicolas 1892. Philippine History Through Selected Sources. Quezon City: Alemar-Phoenix Pub. House, 1967.
MLA-referens (9:e uppl.)Zafra, Nicolas 1892. Philippine History Through Selected Sources. Alemar-Phoenix Pub. House, 1967.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.