Fonte positiva dos dados

Autor de: John Maynard Keynes. 2011: (orelha: professor de Economie Policy Analysis; editor do Journal of Post Keynesian Economics)

LC authorities 13/08/2012: (d.n.23/10/1930)

http://catalogue.bnf.fr: (d.n. 1930, nos Estados Unidos)

http://en.wikipedia.org/wiki/Paul_Davidson_(economist): (d.n. 1930, Brooklyn, Nova York)