amer, r. (1966). theory of interpolation. the institute of national planning.
Cita Chicago (17th ed.)amer, roshdy. Theory of Interpolation. cairo: the institute of national planning, 1966.
Cita MLA (9th ed.)amer, roshdy. Theory of Interpolation. the institute of national planning, 1966.
Atenció: Aquestes cites poden no estar 100% correctes.