Lua APA (7ú heag.)

NOBBS J. (1994). ECONOMICS A CORE TEXT. MC GRAW HILL.

Lua i Stíl Chicago (17ú heag.)

NOBBS J. ECONOMICS A CORE TEXT. NEW YORK: MC GRAW HILL, 1994.

Lua MLA (9ú heag.)

NOBBS J. ECONOMICS A CORE TEXT. MC GRAW HILL, 1994.

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