Agrarian institutions and agricultural productivity, 1994: t.p. (Gregory Clark, Department of Economics and Agricultural History Center, University of California, Davis)

E-mail from Gregory Clark, 7/24/97 (b. Sept. 19, 1957; no middle name)

Contemporary authors online, September 15, 2014 (Gregory Clark, British economist, 1957-; University of California, Davis, 1990-)