APA (7th ed.) Zitazioa

LEFTWICH, R. H. (1969). Introduction to economic thinking. Holt.

Chicago Style (17th ed.) Zitazioa

LEFTWICH, Richard H. Introduction to Economic Thinking. New York: Holt, 1969.

MLA (9th ed.) Zitazioa

LEFTWICH, Richard H. Introduction to Economic Thinking. Holt, 1969.