APA

Leftwich R. H., . (1969). An introduction to economic thinking. New York: Holt, Rinehart and Winston.

Chicago

Leftwich Richard H, . 1969. An introduction to economic thinking. New York: Holt, Rinehart and Winston.

Harvard

Leftwich R. H., . (1969). An introduction to economic thinking. New York: Holt, Rinehart and Winston.

MLA

Leftwich Richard H, . An introduction to economic thinking. New York: Holt, Rinehart and Winston. 1969.