Frazier, L., & Mills, R. Northstar: Listening and speaking (3a ed.).
芝加哥风格引文Frazier, Laurice, 与 Robin Mills. Northstar: Listening and Speaking. 3a ed.
MLA引文Frazier, Laurice, 与 Robin Mills. Northstar: Listening and Speaking. 3a ed.
警告：这些引文格式不一定是100％准确.