Gaya APA

Schoenberg, I, E., Maurer, J. (2006). Focus on grammar –an integrated skills approach (Ed. 2). USA: Pearson longman.

Gaya MLA

Schoenberg, Irene, E., Maurer, Jay. "Focus on grammar –an integrated skills approach". Ed. 2 USA: Pearson longman, 2006. Umum.