Guggenheimer, H. W. (1967). Plane Geometry and Its Groups. Holden-Day.
Citazione stile Chigago Style (17a edizione)Guggenheimer, Heinrich W. Plane Geometry and Its Groups. San Francisco: Holden-Day, 1967.
Citatione MLA (9a ed.)Guggenheimer, Heinrich W. Plane Geometry and Its Groups. Holden-Day, 1967.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.