Zafra, N. (1967). Philippine history through selected source. Alemar-Phoenix Publishing House.
Lua i Stíl Chicago (17ú heag.)Zafra, Nicolas. Philippine History Through Selected Source. Q.C: Alemar-Phoenix Publishing House, 1967.
Lua MLA (9ú heag.)Zafra, Nicolas. Philippine History Through Selected Source. Alemar-Phoenix Publishing House, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.