Robert Fortune (2012). “A Journey to the Tea Countries of China: Including Sung-Lo and the Bohea Hills; with a Short Notice of the East India Company's Tea Plantations in the Himalaya Mountains”, p.329, Cambridge University Press
Albert Einstein (2000). “Albert Einstein in his own words in two complete books: Relativity-the special and general theory; Out of my later years-the scientist, philosopher and man portrayed through his own words”
George Washington, John Jay, Jared Sparks (1850). “Washington's Farewell Address to the People of the United States of America”, p.40, New York : J. Wiley