Cita APA (7th ed.)

Leftwich, R. H. An introduction to economic thinking [by] Richard H. Leftwich.

Cita Chicago (17th ed.)

Leftwich, Richard H. An Introduction to Economic Thinking [by] Richard H. Leftwich. New York, Holt, Rinehart and Winston [1969].

Cita MLA (9th ed.)

Leftwich, Richard H. An Introduction to Economic Thinking [by] Richard H. Leftwich.