Wylie, Clarence R. Jr. quoted in “The Imperfections of Science” by Warren Weaver. Proceedings of the American Philosophical Society, Vol. 104, No. 5, October, 1960.
Vaihinger, Hans. The Philosophy of “As If” Routledge and Keegan Paul, Ltd. 1924.
Valery, Paul. “Moralites” Collected Works of Paul Valery. Princeton University Press, 1989.
Андреас С.: “Моделирование в НЛП” The Magazine for Neuro-Linguistic Programming (UK) Winter No. 46, p. 7.