APA
Swan M., . (2016). Practical english usage 3rd ed. Oxford university press: New Delhi.
Chicago
Swan Michael, . 2016. Practical english usage 3rd ed. Oxford university press: New Delhi.
Harvard
Swan M., . (2016). Practical english usage 3rd ed. Oxford university press: New Delhi.
MLA
Swan Michael, . Practical english usage 3rd ed. Oxford university press: New Delhi. 2016.