Harding 1976, p. X: "The physicist can never subject an isolated hypothesis to experimental test, but only a whole group of hypotheses" (Duhem)... "Duhem denies that unambiguous falsification procedures do exist in science." Harding, Sandra (1976). "Introduction". Can theories be refuted?: essays on the Duhem-Quine thesis. Springer Science & Business Media. pp. IX–XXI. ISBN978-90-277-0630-0.
Harding 1976, p. X. Harding, Sandra (1976). "Introduction". Can theories be refuted?: essays on the Duhem-Quine thesis. Springer Science & Business Media. pp. IX–XXI. ISBN978-90-277-0630-0.
Stanford, Kyle (2023), "Underdetermination of Scientific Theory", in Zalta, Edward N.; Nodelman, Uri (eds.), The Stanford Encyclopedia of Philosophy (Summer 2023 ed.), Metaphysics Research Lab, Stanford University, retrieved 13 January 2025