Reddit reviews Myofascial Pain and Dysfunction: The Trigger Point Manual, Vol. 1 - Upper Half of Body

Yes! These are the absolute Bible of trigger point therapy. They're pretty expensive, but they go muscle by muscle and show you the trigger point locations, where they refer, the effects of the trigger point, exactly how to deactivate them, and ways to prevent them from flaring up again. If you can afford them (Vol 1 is upper body, Vol 2 is lower), they are wonderful.

If the cost is prohibitive, an Amazon search will give you a lot of options. There are everything from wall charts, small booklets, pamphlets, notebooks, to giant tomes.

I don't always know the precise referrals (it's a lot of material) but if I'm finding an area where I feel like I'm spending too much time and not making much progress, that's usually a sign I'm not working efficiently and should look for the real source elsewhere. Good ones to memorize are one in the triceps that affects the front of the shoulder, there's a big trigger point in the quads that tends to release a lot of nearby ones, and there are a couple of major ones in the pecs and biceps that are like off-switches for muscle tension.