Lua APA (7ú heag.)

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

Lua i Stíl Chicago (17ú heag.)

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

Lua MLA (9ú heag.)

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

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