Analysis of information sources in references of the Wikipedia article "Autoritarisme" in Danish language version.
For a long time the authoritative definition of authoritarianism was that of Juan J. Linz. See Linz, 'An Authoritarian Regime: The Case of Spain' in Cleavages, Ideologies and Party Systems, ed. Eric Allard and Yrjo Littunen (Helsinki: Academic, 1964), 255