The chess stars books "According to Kramnik", now fairly old and "Dynamic Reti" by Delchev are both quite decent.
Is there any resource for 1.nf3 players?
... and "Dynamic Reti" by Delchev ...
I thought that was by Davies.
https://web.archive.org/web/20140627005248/http://www.chesscafe.com/text/hansen64.pdf
Are you perhaps thinking of The Modern Reti?
https://www.newinchess.com/media/wysiwyg/product_pdf/7051.pdf
Maybe The Modernized Reti would be of interest.
https://www.newinchess.com/media/wysiwyg/product_pdf/7780.pdf

Look at the games of Kramnik and Ulf Andersson. They both used this extensively with white. Andersson's games are generally very positional while Kramnik has more tactical flair at times. Both of these players are very good with the Catalan opening too. It wouldn't hurt to look at some d4 and c4 players because these openings tend to transpose.
https://www.chess.com/video/player/ulf-anderssons-3-most-instructive-chess-endgames
Grandmaster Chess Strategy by Jürgen Kaufeld & Guido Kern
https://web.archive.org/web/20140708093410/http://www.chesscafe.com/text/review812.pdf
"... For beginning players, [Discovering Chess Openings by GM John Emms] will offer an opportunity to start out on the right foot and really get a feel for what is happening on the board. ..." - FM Carsten Hansen (2006)
https://web.archive.org/web/20140627114655/http://www.chesscafe.com/text/hansen91.pdf
Here are some books that discuss ideas involving 1 Nf3:
Winning Chess Openings by GM Yasser Seirawan (1999).
https://web.archive.org/web/20140627132508/http://www.chesscafe.com/text/hansen173.pdf
Starting Out: The Reti by Neil McDonald (2010).
https://web.archive.org/web/20140627101228/http://www.chesscafe.com/text/hansen131.pdf
The King's Indian attack - Move by Move by GM Neil McDonald (2014)
https://www.newinchess.com/media/wysiwyg/product_pdf/7277.pdf
Starting Out: King's Indian Attack by John Emms (2005)
https://web.archive.org/web/20140627034051/http://www.chesscafe.com/text/hansen81.pdf
Perhaps, it would be of interest to look at The Fianchetto Solution by Emmanuel Neiman and Samy Shoker (2016)
https://www.newinchess.com/media/wysiwyg/product_pdf/9029.pdf
https://www.chess.com/article/view/has-the-king-s-indian-attack-been-forgotten
I used to play an e4 opening player but ive switched to 1.nf3 i like the opening i think i win more with it but when i look at chess resources i feel like they are biased to 1.e4 and 1.d4 players and wouldnt be helpful. For example, there is an app creator the google play store named chess king and i was looking at one of the apps about how to defend against karo cann defense but all the lessons started with 1.e4 any suggestions?