Sorenson, O. Zoltan J. Acs, Catherine Armington: Entrepreneurship, geography, American economic growth.
Dyfyniad Arddull ChicagoSorenson, Olav. Zoltan J. Acs, Catherine Armington: Entrepreneurship, Geography, American Economic Growth.
Dyfyniad MLASorenson, Olav. Zoltan J. Acs, Catherine Armington: Entrepreneurship, Geography, American Economic Growth.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.