1 d4, 2 Nf3 QG Books and Resources

I’ve been playing the 1 d4, 2 Nf3 Queen’s Gambit for a number of years and really like it. The book I used to learn it is okay but doesn’t do a great job of explaining the main plans for different setups. 

I’m looking for any resources, esp repertoire books, that are based on these moves that would help me better understand typical plans. 

I’ve been playing the Queen’s Gambit nearly 50 years. The only book on the opening that I have ever read is Chess Openings: Theory and Practice.

Of course, I’ve played thousands of games and looked at thousands played by others.

Good Chess Openings Books For Beginners and Beyond...https://www.chess.com/blog/RussBell/good-chess-openings-books-for-beginners-and-beyond

Chess Openings Resources for Beginners and Beyond…

https://www.chess.com/blog/RussBell/openings-resources-for-beginners-and-beyond

Thanks for the recommendation. I'm looking for something specifically for the 1 d4, 2 Nf3 lines that explains the ideas. I've been playing this repertoire for a long time. I have lots of lines memorized. But I often don't understand the ideas and am playing by rote.

I’m not sure it’s a recommendation so much as an admission that the opening I’ve played the longest has not been supported by book study.

I.A. Horowitz’s encyclopedia was published more than 60 years ago and considers all openings played then. I’m certain the theory has advanced.

I’ve done some opening study both for and against certain variations of the Queen’s Gambit, including the Catalan, the Ragozin, the Slav, …

Mostly, I rely on what I have observed in my own experience or master games.

Lines I’m favoring now with White:

1.d4 d5 2.c4 Nf6 Nf3

2…c6 3.Nc3

1…Nf6 2.Nf3

In what circumstances are you playing Nf3?