Weisstein, E. W. (1999). CRC concise encyclopedia of mathematics. Chapman & Hall.
Cita Chicago (17th ed.)Weisstein, Eric W. CRC Concise Encyclopedia of Mathematics. Boca Raton, Fl.: Chapman & Hall, 1999.
Cita MLA (9th ed.)Weisstein, Eric W. CRC Concise Encyclopedia of Mathematics. Chapman & Hall, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.