Merdinger, P., & Barton, L. Northstar: Listening and speaking (2a ed.).
芝加哥风格引文Merdinger, Polly, 与 Laurie Barton. Northstar: Listening and Speaking. 2a ed.
MLA引文Merdinger, Polly, 与 Laurie Barton. Northstar: Listening and Speaking. 2a ed.
警告：这些引文格式不一定是100％准确.