APA引文

Penrose, L. S. (1967). The Pathology of Mental Retardation.

Citação norma Chicago

Penrose, L S. The Pathology of Mental Retardation. 1967.

MLA引文

Penrose, L S. The Pathology of Mental Retardation. 1967.

警告：這些引文格式不一定是100％准確.