Gaya APA

Fuchs, M., Bonner, M. (2006). Focus On Grammar : An Integrated Skills Approach (4) (Third Edition). United States: Pearson Education.

Gaya MLA

Fuchs, Marjorie., Bonner, Margaret. "Focus On Grammar : An Integrated Skills Approach (4)". Third Edition United States: Pearson Education, 2006. Text.