Whitby, Simon. Biological Warfare Against Crops, (Google Books), Macmillan, 2002, pp. 106-07, (ISBN0333920856).
Endicott, Stephen and Hagerman, Edward. The United States and Biological Warfare: Secrets from the Early Cold War and Korea, (Google Books), Indiana University Press, 1998, pp. 67-68, (ISBN0253334721).