I have a number of books I use, but would be intrested to hear other peoples ideas on there refference tomes. Mine are in no particular order ... HiFi year books '72 & '74 HiFi choice the little A5[?] ones with catchytitles like Turntables and Tonearms. Newnes Audio and HiFi Engineers pocket book. To name a few. I always keep my eyes open for secondhand books but its useful to know a few other titles to keep looking for.