Cita APA (7a ed.)
Gill, R. T. (1973). Economics: A Text with Included Readings. Goodyear.
Cita estilo Chicago (17a ed.)
Gill, Richard T. Economics: A Text with Included Readings. Pacific Palisandes, EUA: Goodyear, 1973.
Cita MLA (9a ed.)
Gill, Richard T. Economics: A Text with Included Readings. Goodyear, 1973.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.