Fels, Rendigs (1949). «The Long-Wave Depression, 1873-97». The Review of Economics and Statistics (The MIT Press) 31 (1): 69-73. JSTOR1927196. doi:10.2307/1927196.
Fels, Rendigs (1949). «The Long-Wave Depression, 1873-97». The Review of Economics and Statistics (The MIT Press) 31 (1): 69-73. JSTOR1927196. doi:10.2307/1927196.