"We'll Never Conquer Space". Essay by Arthur C. Clarke first published in "Science Digest" (June 1960); later published in Arthur C. Clarke "Profiles of the Future: An Inquiry into the Limits of the Possible", 1962, in Arthur C. Clarke "Voices from the Sky", 1965, and in Arthur C. Clarke "Greetings, Carbon-Based Bipeds!: Collected Essays, 1934-1998", 1999.
Ralph Waldo Emerson, Robert Ernest Spiller, Alfred Riggs Ferguson, Wallace E. Williams, Joseph Slater (1987). “The Collected Works of Ralph Waldo Emerson: Representative men: seven lectures”, p.13, Harvard University Press
"Exclusive Interview With Eve Ensler, Recipient of the 2011 Isabelle Stevenson Tony Award". Interview with Marianne Schnall, www.huffingtonpost.com. December 6, 2017.
"Huckabee: Muslim Can Be President; Obama 'Pretends to Be' Christian, Makes Living Out Faith Difficult" by Samuel Smith, www.christianpost.com. September 23, 2015.