Horowitz and Hill, The Art of Electronics V. Valkenburg, Analogue Filter Design S. Winder, Filter Design D. Lancaster, Active filter Cookbook
A Butterworth filters lab script: http://www.freeinfosociety.com/electronics/schematics/audio/butterworthfilter.pdf
Analogue filter design article: http://www.maxim-ic.com/appnotes.cfm/appnote_number/1795
Optimising filter selectivity: http://www.springerlink.com/content/u7715m3835240711/fulltext.pdf
Programmable IC’s – good comparisons of filter types: http://www.latticesemi.com/lit/docs/appnotes/pac/an6017.pdf?jsessionid=ba30919bf62b$3F3$3FF
Scaling and normalised frequency:
http://books.google.co.uk/books?id=HuPJqvWtedcC&pg=PA251&lpg=PA251&dq=filter+normalized+frequency&source=web&ots=PehhOwmqzu&sig=PoAVy5Bff5TM_A8Y899hKlbD4bI&hl=en&sa=X&oi=book_result&resnum=7&ct=result#PPA253,M1
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