GILL, R. T. (1978). Economics: A text with readings.-- ed.3. Goodyear Pub.
Lua i Stíl Chicago (17ú heag.)GILL, Richard T. Economics: A Text with Readings.-- Ed.3. California: Goodyear Pub, 1978.
Lua MLA (9ú heag.)GILL, Richard T. Economics: A Text with Readings.-- Ed.3. Goodyear Pub, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.