Matthew Fontaine Maury, United States Naval Observatory (1858). “Explanations and sailing directions to accompany the Wind and current charts: approved by Captain D. N. Ingraham, chief of the Bureau of ordnance and hydrography, and pub. by authority of Hon. Isaac Toucey, secretary of the Navy”, p.167
Edgar Mitchell (2009). “The Way of the Explorer: An Apollo Astronaut's Journey Through the Material and Mystical Worlds: Easyread Large Bold Edition”, p.415, ReadHowYouWant.com