Ashworth-Fiedler, S. (1999). Beginner's German grammar. NTC/Contemporary Pub.
芝加哥风格引文Ashworth-Fiedler, Susan. Beginner's German Grammar. Lincolnwood (Chicago), Ill: NTC/Contemporary Pub, 1999.
MLA引文Ashworth-Fiedler, Susan. Beginner's German Grammar. NTC/Contemporary Pub, 1999.
警告：这些引文格式不一定是100％准确.