Alfeld, Peter (16 August 1996). "Why is the square root of 2 irrational?". Understanding Mathematics, a study guide. Department of Mathematics, University of Utah. Arquivado dende o orixinal o 31 de decembro de 2023. Consultado o 6 February 2013.
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Alfeld, Peter (16 August 1996). "Why is the square root of 2 irrational?". Understanding Mathematics, a study guide. Department of Mathematics, University of Utah. Arquivado dende o orixinal o 31 de decembro de 2023. Consultado o 6 February 2013.