C.B. Parker (1994). McGraw-Hill Encyclopaedia of Physics (ط. الثانية). McGraw-Hill. ص. 542. ISBN:978-0-07-051400-3. Bell himself wrote: "If [a hidden variable theory] is local it will not agree with quantum mechanics, and if it agrees with quantum mechanics it will not be local. This is what the theorem says." John Bell, Speakable and Unspeakable in Quantum Mechanics, Cambridge University Press, 1987, p. 65.