I am looking for an interesting material

[Maggieda]

http://edu.chinese.cn/zh-cn/onlinelearn ... llchinese/
In this page, there is a dialogue that belongs to the book "Great Wall Chinese, Essentials in Communication". Besides the text there are excercises about imitation of sounds and pronunciation. As this material is very interesting I would like to know where I could find the other dialogues. Thank you very much.