Okay, when I was using a text guide, I used Gamefaqs. It is
here. My first time through I tried to do find them myself, missed something like 7, and ended up having to print the guide out, go through every area again, and methodically check off the ones I'd already caught. It turned out I'd missed 4 out of 5 of the ones on Snowpeak because the first time I went up the mountain it was daylight.
Strategy wiki also has a guide which is basically the same thing - might be easier to print, though.
I don't think I ever found a video guide - most of them just include the poes in their "complete walkthrough." If you know you're missing them in a certain area you might try looking on youtube for that area.