Best book about EMS info and background

Hey peeps,
just wanted to get some info on what textbooks or manuals on EMS/tens applications that y’all have read or heard good things about. I just wanted to expand my knowledge in this area with more than a journal article here and there. Thanks!
Hakdaddy

There are sections in both the CFTS and Forum Review about EMS, giving program use, frequency, timing in the annual plan, and protocols. CFTS includes photos and diagrams of pad placement. (see if you recognize the athlete getting Zapped)

Isn’t that Mark McKoy?

Yes it is Mark from 1988 in Malaga