Loomis, E. S. (1968). The pythagorean proposition: Its demonstration analyzed and classified and bibliography of sources of the four kinds of "Proofs". National Council of Teachers of Mathematics.
Chicago-referens (17:e uppl.)Loomis, Elisha Scott. The Pythagorean Proposition: Its Demonstration Analyzed and Classified and Bibliography of Sources of the Four Kinds of "Proofs". Washington, D.C: National Council of Teachers of Mathematics, 1968.
MLA-referens (9:e uppl.)Loomis, Elisha Scott. The Pythagorean Proposition: Its Demonstration Analyzed and Classified and Bibliography of Sources of the Four Kinds of "Proofs". National Council of Teachers of Mathematics, 1968.
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