Philip K. Dick, afterword to The Golden Man, Berkley Publishing, 1980.

Ursula K Le Gum, "Science Fiction as Prophesy," in The New Republic, Vol 175, No. 18, October 30,1976, pp. 3334.

Robert Scholes and Enc S. Rabkin, Science Fiction History, Science, Vision, Oxford University Press, 1977, pp 7175, 180.

Philip Strick, "The Age of the Replicant," in Sight & Sound, Vol 5, No 3, Summer, 1982, pp. 168-172.

Angus Taylor, Philip K Dick and the Umbrella of Light, T-K Graphics, 1975, p. 52.

Patricia S Warrick, "The Labyrinthian Process of the Artificial: Philip K. Dick's Androids and Mechanical Constructs," in Philip K Dick, edited by Joseph D Olander and Martin Harry Greenberg, Taplinger Publishing Company, 1983, pp. 189-214.