♦ Micheal J Roberts, "Fundamentals of Signals and Systems", special Indian edition, Tata Mc Graw Hill, 2009.

(Chapter no. 8 to Chapter no.11 CTFS, CTFT, DTFS, DTFT).

♦ Alan V. Oppenheim and Ronald W. Schafer, "Digital Signal Processing", Prentice Hall Publications, 1995.

♦ John G. Prokis and Dimitris G Manolakis, "Digital Signal Processing", Prentice Hall Publications, 1996.

♦ Richard Tolimieri and Myoung and Chao Lu, "Algorithms for Discrete Fourier Transform and Convolution Springer verlag.