Briggs, C. W. (1974). The progressing Philippines [microform]. Photoduplication Service.
Lua i Stíl Chicago (17ú heag.)Briggs, Charles W. The Progressing Philippines [microform]. Quezon City: Photoduplication Service, 1974.
Lua MLA (9ú heag.)Briggs, Charles W. The Progressing Philippines [microform]. Photoduplication Service, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.