Eckhard-Black, C., & Whittle, R. (1992). Cassell's contemporary German: A handbook of grammar current usage, and word power. Macmillan.
芝加哥风格引文Eckhard-Black, Christine, 与 Ruth Whittle. Cassell's Contemporary German: A Handbook of Grammar Current Usage, and Word Power. New York: Macmillan, 1992.
MLA引文Eckhard-Black, Christine, 与 Ruth Whittle. Cassell's Contemporary German: A Handbook of Grammar Current Usage, and Word Power. Macmillan, 1992.
警告：这些引文格式不一定是100％准确.