Interview on September 20, 1988. Included in "Star Trek: The Next Generation, Season 5" DVD No. 7, "Mission Logs: Year Five/A Tribute to Gene Roddenberry",
Michel de Montaigne “Annotated Essays of Michel de Montaigne with English Grammar Exercises: by Michel de Montaigne (Author), Robert Powell (Editor)”, Powell Publications, LLC
William Warburton, Richard Hurd (1811). “The Works: To which is Prefixed a Discourse by Way of General Preface, Containing Some Account of the Life, Writings, and Character of the Author”, p.62