"A Conversation with Marianne Williamson: Powerful pioneer in new thought and spirituality". Interview with Maranda Pleasant, www.marandapleasantmedia.com.
Ralph Waldo Emerson, Robert Ernest Spiller, Alfred Riggs Ferguson, Joseph Slater, Jean Ferguson Carr (1971). “The Collected Works of Ralph Waldo Emerson: Nature, addresses, and lectures”, p.53, Harvard University Press