Lua APA (7ú heag.)

Gardner, B. S. (1984). Economics: Study guide. Houghton Mifflin.

Lua i Stíl Chicago (17ú heag.)

Gardner, Bronfenbrenner Sichel. Economics: Study Guide. Boston: Houghton Mifflin, 1984.

Lua MLA (9ú heag.)

Gardner, Bronfenbrenner Sichel. Economics: Study Guide. Houghton Mifflin, 1984.

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