Alexander. (1978). Practice And Progress: Recorded drills (tapescript). Penerbit Kanisius.
芝加哥风格引文Alexander. Practice And Progress: Recorded Drills (tapescript). Penerbit Kanisius, 1978.
MLA引文Alexander. Practice And Progress: Recorded Drills (tapescript). Penerbit Kanisius, 1978.
警告：这些引文格式不一定是100％准确.