Doughty, C., & Williams, J. Focus on form in classroom second language acquisition (2a ed.).
芝加哥风格引文Doughty, Catherine, 与 Jessica Williams. Focus on Form in Classroom Second Language Acquisition. 2a ed.
MLA引文Doughty, Catherine, 与 Jessica Williams. Focus on Form in Classroom Second Language Acquisition. 2a ed.
警告：这些引文格式不一定是100％准确.