Gaya APA

Leech, S, C, D, B, G. (2003). Student grammar of spoken and written English . Essex, England: Pearson EducationLImited.

Gaya MLA

Leech, Susan, Conrad,, Douglas, Biber,, Geoffrey. "Student grammar of spoken and written English". Essex, England: Pearson EducationLImited, 2003. E-Book.