Παραπομπή APA

Koch, R. S., & Rachel Spack Koch; Keith S Folse. (2006). Focus on grammar: An integrated skills approach. White Plains: Longman, cop.

Παραπομπή Chicago Style

Koch, Rachel Spack, και Rachel Spack Koch; Keith S Folse. Focus On Grammar: An Integrated Skills Approach. White Plains: Longman, cop, 2006.

Παραπομπή MLA

Koch, Rachel Spack, και Rachel Spack Koch; Keith S Folse. Focus On Grammar: An Integrated Skills Approach. White Plains: Longman, cop, 2006.

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