Durrel, C. (1934). Elementary Calculus (1st.). G.Bell & Sons Ltd.
Cita Chicago (17th ed.)Durrel, C. Elementary Calculus. 1st. London: G.Bell & Sons Ltd, 1934.
Cita MLA (9th ed.)Durrel, C. Elementary Calculus. 1st. G.Bell & Sons Ltd, 1934.
Atenció: Aquestes cites poden no estar 100% correctes.