1. Zhu Z. Child psychology. China: People Education Press; 1993.
2. Marsh E. Anxiety disorder. In: Marsh E, editor. Abnormal child psychology. 2nd ed. Guangzhou: Jinan University Press; 2005. p. P246–7.
3. Shen Y. Self control. In: Shen Y, editor. Encyclopedia of child psychology. 3rd ed. Beijing: World Books Publishing House; 2009. p. P247–50.
4. Zhang Z. Lens disorders and surgical management. China: Guangdong science and Technology Press; 2005.
5. Buchner TF, Schnorbus U, Grenzebach UH, et al. Examination of preschool children for refractive errors. First experience using a handheld autorefractor. Ophthalmologe. 2003;100(11):971–8.