Gaya APA

Peterson, P, W. (1982). Writing Skills Practice Book For EFL Beginning/ Intermediate Level (-/1). : United States Departement Of State Office Of English Language Programs.

Gaya MLA

Peterson, Patricia, Wilcox. "Writing Skills Practice Book For EFL Beginning/ Intermediate Level". -/1 : United States Departement Of State Office Of English Language Programs, 1982. Text.