Cita APA (7th ed.)

GILL, R. T. (1978). Economics: A text with readings.-- ed.3. Goodyear Pub.

Cita Chicago (17th ed.)

GILL, Richard T. Economics: A Text with Readings.-- Ed.3. California: Goodyear Pub, 1978.

Cita MLA (9th ed.)

GILL, Richard T. Economics: A Text with Readings.-- Ed.3. Goodyear Pub, 1978.