Lewis, C. (1940). The problem of pain. Collins.
芝加哥风格引文Lewis, C.S. The Problem of Pain. Collins, 1940.
MLA引文Lewis, C.S. The Problem of Pain. Collins, 1940.
警告：这些引文格式不一定是100％准确.
APA引文
Lewis, C. (1940). The problem of pain. Collins.
芝加哥风格引文Lewis, C.S. The Problem of Pain. Collins, 1940.
MLA引文Lewis, C.S. The Problem of Pain. Collins, 1940.