"“So Rich, So Poor”: Peter Edelman on Ending U.S. Poverty & Why He Left Clinton Admin over Welfare Law". "Democracy now" with Amy Goodman, www.democracynow.org. May 23, 2012.
Louis Agassiz (1857). “Contributions to the Natural History of the United States of America: pt. I. Essay on classification. pt. II. North American Testudinata. 1857”, p.170