APA citiranje

Schoenberg, I., & Irene Schoenberg. (2006). Focus on grammar: An integrated skills approach. New York, NY: Pearson/Longman.

Trích dẫn kiểu Chicago

Schoenberg, Irene, và Irene Schoenberg. Focus On Grammar: An Integrated Skills Approach. New York, NY: Pearson/Longman, 2006.

MLA citiranje

Schoenberg, Irene, và Irene Schoenberg. Focus On Grammar: An Integrated Skills Approach. New York, NY: Pearson/Longman, 2006.

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