Image from Wonderlane: (https://flic.kr/p/aa6gBq)
The various demonstrations you'll see on using Zotero to grab information about books, articles, webpages, etc., make it appear easy - and it is!!! However, each time you enter a new item into your Zotero library, look at the information that came in and make corrections as needed.
Adding a Citation Manually (about 2 minutes) from University of Pennsylvania Biomedical Library
Using Zotero (about 15 minutes) from UNC Park Library
Adding Items into Zotero from Zotero.org
FLITE Research Guides