few questions about the reliablility of M-E guides

Hello. I'm new here and ive been studying M-E for over a year now and i read all the books years ago and i've begun rereading them. anyways ive been looking for a reliable guide to middle-earth. Barnes and Noble has the illustrated encyclopedia of middle earth by David day, and i know that people despise david days bestiary, so the question is: " Is David Day's Encyclopedia a reliable source? it sure looks good."

How about the atlas of middle earth by Karen somebody. that is considered reliable correct?