Yale, P. B. (1968). Geometry and symmetry. Holden-Day.
Cita Chicago (17th ed.)Yale, Paul B. Geometry and Symmetry. San Francisco: Holden-Day, 1968.
Cita MLA (9th ed.)Yale, Paul B. Geometry and Symmetry. Holden-Day, 1968.
Atenció: Aquestes cites poden no estar 100% correctes.