APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (9:e uppl.)

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