(1976). English 900 book four. Collier Macmillan international.
芝加哥风格引文English 900 Book Four. New York: Collier Macmillan international, 1976.
MLA引文English 900 Book Four. Collier Macmillan international, 1976.
警告：这些引文格式不一定是100％准确.
APA引文