...so well known as a freethinker that when he was invited the Hibbert Lectures at Oxford, the authorities of Balliol College refused the use of a room for the purpose (infidels.org - abgerufen am 7. Oktober 2019)
James Wood (Hrsg.): Hibbert Lectures". The Nuttall Encyclopædia. London and New York: Frederick Warne. („unsectarian lectures instituted by the trustees of Robert Hibbert, a West India merchant, devoted to the discussion of unsolved problems in theology.“)
