Firkins, O. W., & Firkins, I. T. E. (1934). Memoirs and letters of Oscar W. Firkins. University of Minnesota Press.
Lua i Stíl Chicago (17ú heag.)Firkins, Oscar W., agus Ina Ten Eyck Firkins. Memoirs and Letters of Oscar W. Firkins. Minneapolis: University of Minnesota Press, 1934.
Lua MLA (8ú heag.)Firkins, Oscar W., agus Ina Ten Eyck Firkins. Memoirs and Letters of Oscar W. Firkins. University of Minnesota Press, 1934.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.