Gaya APA

Langan, J., Johson, B. (2009). English Essentials : What Every College Student Needs To Know About Grammar, Punctuation, And Usage (2). United States of America: Mc Graw Hill.

Gaya MLA

Langan, John., Johson, Beth. "English Essentials : What Every College Student Needs To Know About Grammar, Punctuation, And Usage". 2 United States of America: Mc Graw Hill, 2009. Text.