Cita APA (7th ed.)
Tietze, H. (1965). Famous problems of mathematics. Graylock.
Cita Chicago (17th ed.)
Tietze, Heinrich. Famous Problems of Mathematics. Nueva York, EUA: Graylock, 1965.
Cita MLA (9th ed.)
Tietze, Heinrich. Famous Problems of Mathematics. Graylock, 1965.
Atenció: Aquestes cites poden no estar 100% correctes.