http://sites.la.utexas.edu/persian_online_resources/
book: https://www.amazon.com/Farsi-Persian-Beginners-Mastering-Conversational/dp/0804841829/ref=sr_1_1?ie=UTF8&qid=1515290353&sr=8-1&keywords=mastering+conversational+farsi
The books looks good so far. I'm using to help me refresh stuff that I've learned.