Cita APA (7th ed.)

Chalker, S. (1992). A students english grammar: Workbook. Longman.

Cita Chicago (17th ed.)

Chalker, Sylvia. A Students English Grammar: Workbook. Essex: Longman, 1992.

Cita MLA (9th ed.)

Chalker, Sylvia. A Students English Grammar: Workbook. Longman, 1992.