Let me give you some official and important modern books. It is also my own favorite book;
"China Sports Coaches' On-the-job Training Textbook Wushu Routine"
On-the-job Training Textbook for Sports Coaches in China.
On Wushu Culture in China
China Wushu Course Volume I and Volume II.
The last page of the next volume has a lot of introductions of ancient martial arts.