Reddit mentions of Show Networks and Control Systems: Formerly "Control Systems for Live Entertainment"

https://www.amazon.com/Show-Networks-Control-Systems-Entertainment/dp/0692958738/

Here’s one book:
Show Networks and Control Systems

The mixing part is the same. If you are solely the FOH mixer, and you don't want to be in charge of the bigger picture, you have no concerns - just make it sound good and know the consoles you are working on. The system tech is there to make sure that the rig sounds good everywhere in the room, and the PM and riggers are there to make sure it is run and hung safely and efficiently.

If you want to PM on bigger rigs like that, you need to start learning the details of all those people's jobs - not necessarily so you can tell them what to do, but so that you can spot safety issues and inefficiencies, and work hand-in-hand with them to meet your goals.

Here's a good book to start on power: https://www.amazon.com/Electricity-Entertainment-Electrician-Technician-Richard/dp/0415714834

And here is a good book on audio systems: https://www.amazon.com/gp/product/0415731011/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

I haven't read this one on networks yet, but it's probably my next read...maybe others can chime in on wether it is a good one.

https://www.amazon.com/Show-Networks-Control-Systems-Entertainment/dp/0692958738/ref=asc_df_0692958738/?tag=hyprod-20&linkCode=df0&hvadid=312115090752&hvpos=1o1&hvnetw=g&hvrand=449842820588414772&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9061129&hvtargid=pla-415287733133&psc=1

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And of course, nothing beats experience, so weasel your way into bigger jobs and watch what everyone is doing.

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Show Networks and Control Systems: Formerly "Control Systems for Live Entertainment" Second Edition

Correct, I just can’t justify the $50 at this time

Show Networks and Control Systems

The Automated Lighting Programmer’s Handbook

These are two of the good ones for breaking down the basics and going through the whole process. Both are available on Amazon.

Show Networks and Control Systems: Formerly "Control Systems for Live Entertainment"

If it's protocol and how the actual signals work in the industry, I would recommend "Show Networks and Control Systems: Formerly 'Control Systems for Live Entertainment'" by John Huntington.

It'll cover how all of our main protocols work and how the might be connected. It also was just released as a new volume. So information is more up to date.

Show Networks and Control Systems: Formerly "Control Systems for Live Entertainment" https://www.amazon.com/dp/0692958738/ref=cm_sw_r_cp_apa_-fUFAbZY9S31S

I realise that this may be much further in depth than you would need. However the book is structured so that you can bounce around topics as you need. (also a photographer you might learn how to sync your camera up to things you could control in the studio for some extra fun projects )