Gaya APA

Maurer, I, E, S, &, J. (2001). Focus on Grammar : an introduction course for reference and practice . New York: Addison-Wesley Longman, Inc..

Gaya MLA

Maurer, Irene, E., Schoenberg, &, Jay. "Focus on Grammar : an introduction course for reference and practice". New York: Addison-Wesley Longman, Inc., 2001. Text.