Lua APA (7ú heag.)

Doughty, C., & Williams, J. Focus on form in classroom second language acquisition (2a ed.).

Lua i Stíl Chicago (17ú heag.)

Doughty, Catherine, agus Jessica Williams. Focus on Form in Classroom Second Language Acquisition. 2a ed.

Lua MLA (8ú heag.)

Doughty, Catherine, agus Jessica Williams. Focus on Form in Classroom Second Language Acquisition. 2a ed.

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