Journal Article Keller's Societal Evolution Get access Frederick A. Bushée Frederick A. Bushée University of Colorado Search for other works by this author on: Oxford Academic Google Scholar The Quarterly Journal of Economics, Volume 30, Issue 1, November 1915, Pages 172–178, https://doi.org/10.2307/1885808 Published: 01 November 1915

Journal Article Sumner and Keller's Science of Society Get access Hutton Webster Hutton Webster University of Nebraska Search for other works by this author on: Oxford Academic Google Scholar The Quarterly Journal of Economics, Volume 43, Issue 2, February 1929, Pages 324–337, https://doi.org/10.2307/1882476 Published: 01 February 1929