APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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