Books on Vibrato?

[EADGC]

whether for an electric guitar or any string instrument, has there ever just been a definitive, in-depth book for giving a thorough look on proper vibrato and string bending?

so far I've found good books on tremolo picking, travis picking, and pinch harmonics, later to apply to my bass, but anyway, thanks.

[paganjack]

well vibrato on fretted and fretless instruments is different for starters. the motions are perpendicular to each other basically. i doubt there are entire books on the issue, since it's really just a feel thing. if you can do a smooth vibrato and control your speed well, you can do it all. maybe i'm wrong but i have never seen a book on just vibrato