Cita APA (7a ed.)

Hardwick, P., Langmead, J., & Khan, B. (1990). An introduction to modern economics (3rd ed.). Longman.

Cita Chicago Style (17a ed.)

Hardwick, Philip, John Langmead, y Bahadur Khan. An Introduction to Modern Economics. 3rd ed. London: Longman, 1990.

Cita MLA (9a ed.)

Hardwick, Philip, et al. An Introduction to Modern Economics. 3rd ed. Longman, 1990.