Frederick Douglass (2017). “FREDERICK DOUGLASS, AN AMERICAN SLAVE – Astounding Life of One Incredible Man (3 Autobiographies in One Volume): The Most Important African American Leader of the 19th Century: The Escape from Slavery, Life as a World-Renowned Activist against Slavery and Racism & Political Career after the Civil War”, p.740, e-artnow
Lev Shestov, Franz Rosenzweig, Martin Buber (1969). “Great twentieth century Jewish philosophers: Shestov, Rosenzweig, Buber, with selections from their writings”
"A Tribute to Yip Harburg: The Man Who Put the Rainbow in The Wizard of Oz". "Democracy Now!" with Amy Goodman, www.democracynow.org. November 25, 2004.