Davis and Hersh, "Abstraction", The Mathematical Experience, Houghton Mifflin, 1981, 127-130.
Davis, Flora, Inside Intuition, McGraw-Hill, 1973.
Dordick and Wang, The Information Society, Sage, 1993.
Douglas, Mary, How Institutions Think, Syracuse University Press, 1986.
Draper, Ellen Dooling, "Focus," in Parabola: The Magazine of Myth and Tradition: The Oral Tradition, Volume XVII, Number 3, August, 1992.