Gaya APA

Yun, Y, P., wei, W, Z. (1999). Explanations of Difficult Points In Chinese Learning as a Foreign Language . China: Beijing Langauge and Culture University Press.

Gaya MLA

Yun, Ye, Pan., wei, Wu, Zhong. "Explanations of Difficult Points In Chinese Learning as a Foreign Language". China: Beijing Langauge and Culture University Press, 1999. Text.