Keltner, A., & Bitterlin, G. English for adult competency 2.
芝加哥风格引文Keltner, Autumn, 与 Gretchen Bitterlin. English for Adult Competency 2. New Jersey;Prentice Hall Inc..,;1981.
MLA引文Keltner, Autumn, 与 Gretchen Bitterlin. English for Adult Competency 2.
警告：这些引文格式不一定是100％准确.