My current main references for LaTeX are The LaTeX Companion 2nd edition by Mittelbach and Goosens and More Math into LaTeX 4th edition by Gratzer. Both are excellent and serve me well, but the former is from 2004 and the latter from 2007.
I know there are lots of new developments and I know there is a 5th edition of Math into LaTeX but I am not sure what is new in the 5th edition.
My main interest is in writing a statistics book using LaTeX.
I'd like to know if the book section, in particular, has been changed and also in what other resources might be useful.
I would consider myself an intermediate user of LaTeX (at best).