William Shakespeare (2013). “Making Sense of Hamlet! a Students Guide to Shakespeare's Play (Includes Study Guide, Biography, and Modern Retelling)”, p.240, BookCaps Study Guides
Max Muller (2013). “Sacred Books of the East: Including Selections from the Vedic Hymns, Zend-Avesta, Dhammapada, Upanishads, the Koran, and the Life of Buddha”, p.160, Lulu Press, Inc