Guggenheimer, H. W. (1967). Plane geometry and its groups. Holden-Day.
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Chicago-čujuhus (17. p.)
Guggenheimer, Heinrich W. Plane Geometry and Its Groups. San Francisco, EUA: Holden-Day, 1967.
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MLA-čujuhus (9. p.)
Guggenheimer, Heinrich W. Plane Geometry and Its Groups. Holden-Day, 1967.
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