APA aipamena

Eckstut, S., & Samuela Eckstut. (2006). Focus on grammar: An integrated skills approach. New York, NY: Pearson/Longman.

Chicago Style aipamena

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

MLA aipamena

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

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