Migration and the international labour market, 1850-1939, 1994: CIP t.p. (Jeffrey G. Williamson) CIP data sheet (b. 11-26-35)
Modeling urbanization and economic growth, 1980: t.p. (J.G. Williamson) p. 85 (Jeffrey G. Williamson; Visiting Research Scholar, International Institute for Applied Systems Analysis; prof. of economics, Univ. of Wisconsin, Madison)