Ingersoll, R. G. (1910). Complete lectures of Col. R.G. Ingersoll. J. Regan & Co.
Lua i Stíl Chicago (17ú heag.)Ingersoll, Robert Green. Complete Lectures of Col. R.G. Ingersoll. Chicago, Ill.: J. Regan & Co, 1910.
Lua MLA (8ú heag.)Ingersoll, Robert Green. Complete Lectures of Col. R.G. Ingersoll. J. Regan & Co, 1910.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.