Perrn, G. E. (1968). Teachers of English as a second language: Their training and preparation. University Press.
芝加哥风格引文Perrn, G. E. Teachers of English as a Second Language: Their Training and Preparation. Cambridge: University Press, 1968.
MLA引文Perrn, G. E. Teachers of English as a Second Language: Their Training and Preparation. University Press, 1968.
警告：这些引文格式不一定是100％准确.