Cita APA (7th ed.)
Bell, E. T. (1937). Men of Mathematics (1a.ed.). Penguin books.
Cita Chicago (17th ed.)
Bell, E. T. Men of Mathematics. 1a.ed. Middlesex: Penguin books, 1937.
Cita MLA (9th ed.)
Bell, E. T. Men of Mathematics. 1a.ed. Penguin books, 1937.
Atenció: Aquestes cites poden no estar 100% correctes.