You can pick up a copy of Val Shepherd's 'Historic Wells in and around Bradford' from Spooks on Haworth main street, if you're in the area. It's just over a fiver. It doesn't jst cover Bradford, but parts of Leeds, Kirklees,Calderdale and North Yorkshire too.
She's also written a booklet called 'Holy Wells of West Yorkshire and the Dales', which you can get for less than a fiver from the same shop in Haworth!
(I should be on commission, eh?!)
Cheers
Dave