Cita APA (7a ed.)

Ridell, T., Shackelford, J., & Stamos, S. (1991). Economics: A tool for understanding society (4th ed.). Addison-Wesley.

Cita Chicago Style (17a ed.)

Ridell, Tom, Jean Shackelford, y Steve Stamos. Economics: A Tool for Understanding Society. 4th ed. Reading, Mass. [etc.]: Addison-Wesley, 1991.

Cita MLA (9a ed.)

Ridell, Tom, et al. Economics: A Tool for Understanding Society. 4th ed. Addison-Wesley, 1991.