APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (9:e uppl.)

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