Friederang, S. CD exercises.
芝加哥风格引文Friederang, Steve. CD Exercises.
MLA引文Friederang, Steve. CD Exercises.
警告：这些引文格式不一定是100％准确.
APA引文
Friederang, S. CD exercises.
芝加哥风格引文Friederang, Steve. CD Exercises.
MLA引文Friederang, Steve. CD Exercises.