My list:

1. Getting to Product/Market Fit: Running Lean by @ashmaurya
2. Scaling Post Product/Market Fit: Hacking Growth by @sean & @morgan
3. Cracking Acquisition: Traction by @yegg & @justinmares
4. Optimizing Onboarding: The Elements of User Onboarding by @samuelhulick
4. User Engagement: Hooked by @nireyal
5. Scaling Network Effect/Platform Type Businesses: Platform Scale by @sanguit
6. Analytics: Lean Analytics by Alistair Croll & @byosko

Also here's some past book related discussions from the past:
https://growthhackers.com/questions/ask-gh-what-are-some-of-the-best-non-growth-hacking-books-that-youve-learned-growth-from/
https://growthhackers.com/questions/ask-gh-whats-your-favorite-marketing-or-growth-book/
https://growthhackers.com/questions/ask-gh-what-are-the-best-resources-books-for-b2b-saas-pricing/
https://growthhackers.com/questions/ask-gh-could-anyone-recommend-me-seo-books/
https://growthhackers.com/questions/what-must-read-books-have-made-the-biggest-impact-on-your-marketing-skill-set
https://growthhackers.com/questions/ask-gh-what-growth-related-books-are-you-reading-right-now-and-what-are-you-learning-from-them/
https://growthhackers.com/questions/ask-gh-what-books-should-i-read-to-help-build-a-solid-foundation-for-growth-hacking/
https://growthhackers.com/questions/are-there-any-books-written-by-lady-growth-hackers-and-if-yes-which-are-the-greatest-ones/

If you want to read fundamentals of AARRR process with world's best practices, take a look at Introduction to Growth Hacking ( htttp://www.introductiontogrowthhacking.com ) This is my first e-book that I published two years ago.

Everything Anuj suggested +

1. Lean startup by Eric Ries
2. Rework by Jason Friend
3. Hacking Growth by Sean Ellis
4. Scientific Advertising by claude hopkins - Old book but still a good read.
5. Cashvertising on copy writing - not particularly for SaaS for any online biz.

I'd suggest Product Demos That Sell by Steli Efti.
Also +1 Elements of User onboarding by @samuelhulick and Reworked by Jason Fried.

FYI, here's the final version of this blogpost http://blog.avangate.com/brilliant-books-that-saas-experts-recommend/
Hope you'll find it useful!