Most well-stocked music stores will offer a variety of reference books for guitarists that include sheet music, playing instructions, tablature, and guitar chord charts. You don't have to be a full-fledged expoert to utilize these as they are be aimed at many levels of players, from the rank beginner to the experienced classical guitarist, finger picker, or dedicated shredder. So by looking at your own specific needs, you can browse any music store, either brick-and-mortar or online based, and find what you're looking for.
Don't forget readability either. Don't choose a course or book that's chock full of information but that's not presented in a legible, easy-to-follow manner. You'll end up never reading the book through as it's not polished enough to help you learn the chords you want to.
When considering a book aimed at guitar chord charts, variety should be a top priority for you. Say you've played guitar for a while and know the basic chords. If the book you're leafing through only inludes the most basic fingerings and easiest chords, it's definitely not for you. On the flip side of that, if you're not careful you may end up with a guide filled hundreds or even thousands of different chords that are just beyond you as a beginning player.
A website or online course featuring printable charts might serve your needs just as well as a comprehensive reference book, giving you the flexibility to pick and choose what chords you print out for a specific use, such as one particular song you want to learn, or an alternate fingering for smoother play. It's not a bad idea to consider an online course with plenty of videos so you can play along as you watch the teacher.
