J. Bradford DeLong (1989), "The `Protestant Ethic' Revisited: A Twentieth-Century Look."
J. Bradford DeLong (1989), "The `Protestant Ethic' Revisited: A Twentieth-Century Look," Fletcher Forum 13: 2 (Summer), pp. 229-242.
http://www.j-bradford-delong.net/pdf_files/Protestant_Ethic.pdf