Koch, R. S., & Rachel Spack Koch; Keith S Folse. (2006). Focus on grammar: An integrated skills approach. White Plains: Longman, cop.
استشهاد بنمط شيكاغوKoch, Rachel Spack, و Rachel Spack Koch; Keith S Folse. Focus On Grammar: An Integrated Skills Approach. White Plains: Longman, cop, 2006.
MLA استشهادKoch, Rachel Spack, و Rachel Spack Koch; Keith S Folse. Focus On Grammar: An Integrated Skills Approach. White Plains: Longman, cop, 2006.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.