Armamento, V. B. (1972). The indomitable. The Viking.
Lua i Stíl Chicago (17ú heag.)Armamento, Vidal Brigoli. The Indomitable. Pasay City: The Viking, 1972.
Lua MLA (9ú heag.)Armamento, Vidal Brigoli. The Indomitable. The Viking, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.