Crayton, C. A. (2004). The A+ exams guide: (exam 220-301), (exam 220-302). Charles River Media.
芝加哥风格引文Crayton, Christopher A. The A+ Exams Guide: (exam 220-301), (exam 220-302). Hingham, Mass.: Charles River Media, 2004.
MLA引文Crayton, Christopher A. The A+ Exams Guide: (exam 220-301), (exam 220-302). Charles River Media, 2004.
警告：这些引文格式不一定是100％准确.