Παραπομπή APA

Koch, R. S., & Kolse, K. S. (2000). Focus on grammar: An advanced course for reference and practice : workbook. White Plains, NY: Addison-Wesley Longman.

Παραπομπή Chicago Style

Koch, Rachel Spack, και Keith S. Kolse. Focus On Grammar: An Advanced Course for Reference and Practice : Workbook. White Plains, NY: Addison-Wesley Longman, 2000.

Παραπομπή MLA

Koch, Rachel Spack, και Keith S. Kolse. Focus On Grammar: An Advanced Course for Reference and Practice : Workbook. White Plains, NY: Addison-Wesley Longman, 2000.

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