National Geographic Society. The Philippines. National Geographic Society, 1945.
Lua i Stíl Chicago (17ú heag.)National Geographic Society. The Philippines. Washington, D.C: National Geographic Society, 1945.
Lua MLA (9ú heag.)National Geographic Society. The Philippines. National Geographic Society, 1945.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.