Murphy, R., & Altman, R. Grammar in use. Reference and practice for intermediate students of English. Answer Key.
芝加哥风格引文Murphy, Raymond, 与 Roann Altman. Grammar in Use. Reference and Practice for Intermediate Students of English. Answer Key.
MLA引文Murphy, Raymond, 与 Roann Altman. Grammar in Use. Reference and Practice for Intermediate Students of English. Answer Key.
警告：这些引文格式不一定是100％准确.