Cita APA (7a ed.)
Kohler, H. Economics: The Science of Scarcity. Dryden.
Cita estilo Chicago (17a ed.)
Kohler, Heinz. Economics: The Science of Scarcity. Hinsdale, EUA: Dryden.
Cita MLA (9a ed.)
Kohler, Heinz. Economics: The Science of Scarcity. Dryden.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.