Berg, F. S. (1978). Listening and speech training package. Grune & Stratton.
芝加哥风格引文Berg, Frederick S. Listening and Speech Training Package. New York: Grune & Stratton, 1978.
MLA引文Berg, Frederick S. Listening and Speech Training Package. Grune & Stratton, 1978.
警告：这些引文格式不一定是100％准确.