# References for “high-school mathematics from an advanced point of view”

What are some good references for high-school (or even middle-school) mathematics, written from an advanced point of view, especially texts written for prospective teachers?

Some references were given in a comment for an earlier question, but I cannot find that one now ...

-
I sympathize with this question, because unfortunately a lot of valuable content on this site is getting hidden in the comments. –  Chris Cunningham May 5 at 15:36
–  Benjamin Dickman May 5 at 17:03
Check this and this. –  metacompactness May 25 at 21:58

Right now the best-known book of this sort is "Mathematics for High School Teachers -- An Advanced Perspective" by Zalman Usiskin. (I say "right now" because I have grandiose plans of writing such a textbook myself, but not until after I get tenure, i.e. not for at least 3 years.)

-