ALLSOP, J. (1988). Penguin english tests book 1. Penguin Books.
芝加哥风格引文ALLSOP, Jake. Penguin English Tests Book 1. London: Penguin Books, 1988.
MLA引文ALLSOP, Jake. Penguin English Tests Book 1. Penguin Books, 1988.
警告：这些引文格式不一定是100％准确.
APA引文