Bell, R. J. T. (1912). Elementary Treatise on Coordinate Geometry of Three Dimensions (3rd ed.). Macmillan.
Cita Chicago (17th ed.)Bell, Robert J. T. Elementary Treatise on Coordinate Geometry of Three Dimensions. 3rd ed. London: Macmillan, 1912.
Cita MLA (9th ed.)Bell, Robert J. T. Elementary Treatise on Coordinate Geometry of Three Dimensions. 3rd ed. Macmillan, 1912.
Atenció: Aquestes cites poden no estar 100% correctes.