Cita APA (7a ed.)

Close, R. (1991). A University Grammar of English. Workbook (1st ed., 18th impression.). Longman.

Cita Chicago Style (17a ed.)

Close, R.A. A University Grammar of English. Workbook. 1st ed., 18th impression. Harlow: Longman, 1991.

Cita MLA (9a ed.)

Close, R.A. A University Grammar of English. Workbook. 1st ed., 18th impression. Longman, 1991.