Introduction by Andrew Tobias to Extraordinary Popular Delusions and the Madness of Crowds (New York: Harmony Press, 1980) available at Andrew Tobias: Money and Other SubjectsArchived September 18, 2008, at the Wayback Machine. Retrieved on August 12, 2008
Phillips, S. "Tulip breaking potyvirusArchived February 20, 2009, at the Wayback Machine", in Brunt, A. A., Crabtree, K., Dallwitz, M. J., Gibbs, A. J., Watson, L. and Zurcher, E. J. (eds.) (1996 onwards). Plant Viruses Online: Descriptions and Lists from the VIDE Database. Version: August 20, 1996. Retrieved on August 15, 2008.
Phillips, S. "Tulip breaking potyvirusArchived February 20, 2009, at the Wayback Machine", in Brunt, A. A., Crabtree, K., Dallwitz, M. J., Gibbs, A. J., Watson, L. and Zurcher, E. J. (eds.) (1996 onwards). Plant Viruses Online: Descriptions and Lists from the VIDE Database. Version: August 20, 1996. Retrieved on August 15, 2008.
Introduction by Andrew Tobias to Extraordinary Popular Delusions and the Madness of Crowds (New York: Harmony Press, 1980) available at Andrew Tobias: Money and Other SubjectsArchived September 18, 2008, at the Wayback Machine. Retrieved on August 12, 2008