Citazione Stile APA (7a Edizione)

Hardwick, P., & Langmead, J. a. K. B. (1999). An introduction to modern economics (5th ed.). Prentice hall.

Citazione stile Chigago Style (17a edizione)

Hardwick, Philip, e John and Khan Bhadur Langmead. An Introduction to Modern Economics. 5th ed. Harlow, England: Prentice hall, 1999.

Citatione MLA (9a ed.)

Hardwick, Philip, e John and Khan Bhadur Langmead. An Introduction to Modern Economics. 5th ed. Prentice hall, 1999.