APA-ийн эшлэл(7 дахь хэвлэлт)

Doughty, C. J., & Williams, J. (1998). Focus on form in classroom second language acquisition. Cambridge University.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Doughty, Catherine J., ба Jessica Williams. Focus on Form in Classroom Second Language Acquisition. Nueva York: Cambridge University, 1998.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Doughty, Catherine J., ба Jessica Williams. Focus on Form in Classroom Second Language Acquisition. Cambridge University, 1998.