HEATHFIELD, D. (1992). Modern Economics David Heathfield, Mark Russel. Harvester Wheatsheaf.
Lua i Stíl Chicago (17ú heag.)HEATHFIELD, David. Modern Economics David Heathfield, Mark Russel. Harvester Wheatsheaf, 1992.
Lua MLA (8ú heag.)HEATHFIELD, David. Modern Economics David Heathfield, Mark Russel. Harvester Wheatsheaf, 1992.
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