Hayden, J. R. The Philippines A study in national development. The macmillan company.
Lua i Stíl Chicago (17ú heag.)Hayden, Joseph Ralston. The Philippines A Study in National Development. The macmillan company.
Lua MLA (8ú heag.)Hayden, Joseph Ralston. The Philippines A Study in National Development. The macmillan company.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.