Hi there!
We thought we would share some interesting data we have compiled with our teachers on which books they have. This is not complete yet but gives some ideas on which books are more popular amongst Chinese teachers (we have 190 Chinese teachers now).
We hope this data might help some of you decide which books to consider (next). If you are *very* happy with a book and cannot see it in the list, please let us know (the books where you do not see any teachers having them are books recommended by students).
The link is http://www.chineseteachers.com/best-books-and-resources-to-learn-mandarin-chinese
We hope you find this useful. Please do not hesitate to comment to let us know what you think, or what other data you would like to see.