Shelley M.Mark. (1959). Economics in action. Wadsworth.
Cita Chicago (17th ed.)Shelley M.Mark. Economics in Action. San Francisco: Wadsworth, 1959.
Cita MLA (9th ed.)Shelley M.Mark. Economics in Action. Wadsworth, 1959.
Atenció: Aquestes cites poden no estar 100% correctes.