APA (7th ed.) Citation

Parkin, M., & Spencer, D. E. (1990). Economics: Study guide. Addison-Wesley.

Chicago Style (17th ed.) Citation

Parkin, Michael, and David E. Spencer. Economics: Study Guide. Reading, Mass: Addison-Wesley, 1990.

MLA (9th ed.) Citation

Parkin, Michael, and David E. Spencer. Economics: Study Guide. Addison-Wesley, 1990.