(1983). Houghton Mifflin English: Resource book level 6. Houghton Mifflin Co..
芝加哥风格引文Houghton Mifflin English: Resource Book Level 6. Boston: Houghton Mifflin Co., 1983.
MLA引文Houghton Mifflin English: Resource Book Level 6. Houghton Mifflin Co., 1983.
警告：这些引文格式不一定是100％准确.