These are some notes on Fourier transforms for complete beginners.
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Appendix A of Condon & Ransom is a great review, but fairly compressed: http://www.cv.nrao.edu/~sransom/web/A1.html
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Boas, "Mathematical Methods in the Physical Sciences", is pretty good. (PI library: QA37.2 BOA 1983)
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This online book is OK: it's very complete but sometimes not very digestible. It's a great source for examples! https://ccrma.stanford.edu/~jos/mdft/mdft.html