PARKER, J. (2001). Emma's problem.-- ed.1. McGraw-Hill Interamericana.
芝加哥风格引文PARKER, John. Emma's Problem.-- Ed.1. Mexico: McGraw-Hill Interamericana, 2001.
MLA引文PARKER, John. Emma's Problem.-- Ed.1. McGraw-Hill Interamericana, 2001.
警告：这些引文格式不一定是100％准确.