APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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