Ingersoll, R. G. (1929). The works of Robert G. Ingersoll .. Ingersoll league.
Lua i Stíl Chicago (17ú heag.)Ingersoll, Robert Green. The Works of Robert G. Ingersoll .. New York: Ingersoll league, 1929.
Lua MLA (8ú heag.)Ingersoll, Robert Green. The Works of Robert G. Ingersoll .. Ingersoll league, 1929.
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