This is a good reference book for mat Pilates. The sections on apparatus and small equipment are really not worth it.

It's well laid out with clear instructions, watch points and photographs. 

This was published in 2010 and it felt like an older Pilates book. There are a few things I wouldn't do as a teacher but I know I was encouraged to do as a student many years ago. 

I recommend this, alongside other books, as a good reference book for new mat teachers.