Writing Improvement Project. (1977). Building English skills. McDougal, Littell & Company.
芝加哥风格引文Writing Improvement Project. Building English Skills. Evanston, Illinois: McDougal, Littell & Company, 1977.
MLA引文Writing Improvement Project. Building English Skills. McDougal, Littell & Company, 1977.
警告：这些引文格式不一定是100％准确.