Xu, D. (2005). Yuan yin li lun yan jiu: Guan yu he tong (fa lü xing wei) xiao li zheng dang xing de yi zhong shuo ming mo shi = Research into the theory of cause : an interpretation model on the legitimacy of contracts or juridical acts (Di 1 ban.). Beijing Shi: Zhongguo zheng fa da xue chu ban she.

Xu, Diyu. Yuan Yin Li Lun Yan Jiu: Guan Yu He Tong (fa Lü Xing Wei) Xiao Li Zheng Dang Xing De Yi Zhong Shuo Ming Mo Shi = Research Into the Theory of Cause : An Interpretation Model On the Legitimacy of Contracts or Juridical Acts. Di 1 ban. Beijing Shi: Zhongguo zheng fa da xue chu ban she, 2005.

Xu, Diyu. Yuan Yin Li Lun Yan Jiu: Guan Yu He Tong (fa Lü Xing Wei) Xiao Li Zheng Dang Xing De Yi Zhong Shuo Ming Mo Shi = Research Into the Theory of Cause : An Interpretation Model On the Legitimacy of Contracts or Juridical Acts. Di 1 ban. Beijing Shi: Zhongguo zheng fa da xue chu ban she, 2005.