Cita APA (7th ed.)

Fels, R. (1966). An introduction to economics: The challenge to the American economy (2nd ed.). Allyn and Bacon.

Cita Chicago (17th ed.)

Fels, Rendings. An Introduction to Economics: The Challenge to the American Economy. 2nd ed. Boston: Allyn and Bacon, 1966.

Cita MLA (9th ed.)

Fels, Rendings. An Introduction to Economics: The Challenge to the American Economy. 2nd ed. Allyn and Bacon, 1966.