APA (7th ed.) Citation

Close, R. A. (1991). A University grammar of English workbook. Longman Group.

Chicago Style (17th ed.) Citation

Close, R. A. A University Grammar of English Workbook. Harlow Essex, England: Longman Group, 1991.

MLA (9th ed.) Citation

Close, R. A. A University Grammar of English Workbook. Longman Group, 1991.