https://www.biggerpockets.com/renewsblog/2010/06/3...
This post is better and more succinct than anything I've read in a book on the specific topic of analyzing multi family.
As for books -- my favorites are millionaire real estate investor by Gary Keller and multi family millions by Dave lindahl.
But if I were you I would spend as much time as possible looking at deals in the specific markets you're interested in. Many of the rules of thumb and other ways investors typically analyze deals don't apply as well here in Southern CA.
You need to know as accurately as possible what the market will bear for each unit and what a great price really is. I would definitely suggest leveraging the knowledge of a good realtor if this is your first deal...get out and talk to people at open houses. Listen to the podcasts here on BP and hang out in the multi family forums!
Email or message me if I can be of any assistance! Happy to help :-)