1. Edwards R-E, Fourier Series, (New York: Holt, Rinehart and Winston Inc.) (1967) vol.II
2. Gelfand I, Raikov D and Shilov G, Commutative normed rings (New York: Chelse Publication Company) (1964)
3. Reiter H and Stegeman J D, Classical harmonic analysis and locally compact abelian groups (Oxford: Clarendon Press) (2000)