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.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.