There are many free online tools that help make creating citations less of a pain, and you can see the best of them at The Best Resources For Learning Research & Citation Skills.
There’s a new one in town called RefME, and it may be the best of the bunch. Unlike some of the others, though, you do have to create a free account and login before you use it.
Here’s a video describe how it works:
Thanks to Education DIVE for the tip.