Еуклидова геометрија — разлика између измена

* {{cite book|author=Nagel, E. and Newman, J.R.|title=Gödel's Proof|publisher = New York University Press|year= 1958}}

* -{Alfred Tarski (1951) ''A Decision Method for Elementary Algebra and Geometry''. Univ. of California Press.}-

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* {{Cite book | last = Coxeter | first = H.S.M. | title = Introduction to Geometry | year = 1961 | publisher = Wiley | location = New York}}