BELL CHIP R. (1991). AT YOUR SERVICE: TRAINERS KIT+6. QUALITY RESOURCES.
芝加哥风格引文BELL CHIP R. AT YOUR SERVICE: TRAINERS KIT+6. NEW YORK: QUALITY RESOURCES, 1991.
MLA引文BELL CHIP R. AT YOUR SERVICE: TRAINERS KIT+6. QUALITY RESOURCES, 1991.
警告：这些引文格式不一定是100％准确.