We've get knowledges from the following sources:

A Serious of <<Lovely Beijing>>
First Release Published in January, 1991
The Youngster Press of Beijing
6# Middle Way of North Sanhuan Street, Beijing, China

<<Dictionary about scenic spots and historic sites in Beijing >>

<<Outlaws of the Marsh>> by Shi Nai'an and Luo Guanzhong, Translated by Sidney Shapiro
Foreign Languages Press
24 Baiwanzhuang Road, Beijing, China

<<Chinese>>