Gaya APA

Schoenberg, I, E., Maurer, J. (2006). Focus On Grammar: An Integrated Skills Approach . New York: Pearson Longman.

Gaya MLA

Schoenberg, Irene, E.., Maurer, Jay. "Focus On Grammar: An Integrated Skills Approach". New York: Pearson Longman, 2006. Text.