Possibly helpful:
The Nimzo-Larsen Attack: Move by Move (2013)
https://web.archive.org/web/20140627052905/http://www.chesscafe.com/text/hansen175.pdf
http://www.jeremysilman.com/shop/pc/Nimzo-Larsen-Attack-Move-by-Move-The-76p3830.htm
Play 1 b3!
https://web.archive.org/web/20140627104235/http://www.chesscafe.com/text/hansen114.pdf
"Many opening monographs have enthusiastic titles of the form Winning with the... and invite the reader to ingest some marvellous system or other and rack up points - either by encyclopaedic knowledge of main lines or the methodical application of simple strategies. So let us make it clear, first of all, that White has no advantage in the Nimzo-Larsen. The lines in ECO, for example, conclude mostly in '=' (equal) or 'unclear', with just a few '+=' (White stands slightly better) and even these '+=' seem optimistic. Nor is the Nimzo-Larsen a 'system' opening in which the first moves are played parrot-fashion regardless of the replies. There are system-like elements in some variations - the plan Bb5, Ne5, f2-f4 in the reversed Nimzo-Indian (Chapter 4) for instance - but more often White (and Black) can do just about anything. Anyone who likes to win their games in the opening should therefore look elsewhere." - Byron Jacobs & Jonathan Tait (2001) in Nimzo-Larsen Attack
https://web.archive.org/web/20140626223637/http://www.chesscafe.com/text/hansen27.pdf
Any good book recommendations to learn the Nimzo-Larsen Attack? I'm also happy to hear comments or toughts how to play the opening. Opinions are also welcome! Thanks for the future answers!