Robinson, G. d. B. (1959). The foundations of geometry (4th edition.). University of Toronto Press.
Lua i Stíl Chicago (17ú heag.)Robinson, Gilbert de Beauregard. The Foundations of Geometry. 4th edition. Toronto: University of Toronto Press, 1959.
Lua MLA (8ú heag.)Robinson, Gilbert de Beauregard. The Foundations of Geometry. 4th edition. University of Toronto Press, 1959.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.