"Blue Carbon: The Role of Healthy Oceans in Binding Carbon : a Rapid Response Assessment" by Christian Nellemann, Emily Corcoran, UNEP/Earthprint, (p. 23), 2009.
Edgar Mitchell (2009). “The Way of the Explorer: An Apollo Astronaut's Journey Through the Material and Mystical Worlds: Easyread Large Bold Edition”, p.454, ReadHowYouWant.com
Edgar Mitchell (2009). “The Way of the Explorer: An Apollo Astronaut's Journey Through the Material and Mystical Worlds: Easyread Large Bold Edition”, p.454, ReadHowYouWant.com