APA (7th ed.) Citation

Hardwick, P., Khan, B., & Lamgmead, J. (1991). An introduction to modern economics (3rd ed. 2nd impression.). Longman.

Chicago Style (17th ed.) Citation

Hardwick, Philip, Bahadur Khan, and John Lamgmead. An Introduction to Modern Economics. 3rd ed. 2nd impression. London: Longman, 1991.

MLA (9th ed.) Citation

Hardwick, Philip, et al. An Introduction to Modern Economics. 3rd ed. 2nd impression. Longman, 1991.