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    • Gaya APA

    Koch, B, S, A, R, S. (2009). Understanding and Using English Grammar Student Book (with Answer Key) and Online Access . : Allyn & Bacon.

    Gaya MLA

    Koch, Betty, Schrampfer, Azar;, Rachel, Spack. "Understanding and Using English Grammar Student Book (with Answer Key) and Online Access". : Allyn & Bacon, 2009. Text.