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Matt Friehauf, Mikaela Hertel, Juan Liu, and Stacey Luong On Compass and Straightedge Constructions: Means(PDF). UNIVERSITY of WASHINGTON, DEPARTMENT OF MATHEMATICS. 2013 [14 June 2018]. （原始内容存档(PDF)于2018-06-14）.
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Matt Friehauf, Mikaela Hertel, Juan Liu, and Stacey Luong On Compass and Straightedge Constructions: Means(PDF). UNIVERSITY of WASHINGTON, DEPARTMENT OF MATHEMATICS. 2013 [14 June 2018]. （原始内容存档(PDF)于2018-06-14）.
