Learn Ruby/Appium

Hi everyone!

I am a QA Engineer with 6 years of experience on manual testing and 1 as a developer, at the beginning of my career.
Now I should start learning Ruby/Appium to test Android and iOS native apps at work. Could you please advise me any book for Ruby and Appium considering that I had some experience in programming (not much)?
I would like something that allows me to start asap so I can improve my skills later on. I don’t expect to be an experienced automation tester in 2 weeks.