Etymology of authoritarian DETAILED [closed]

How do I get beyond the Etymonline etymology of authoritarian to see to first uses of the word in 1859 and 1862?


The Oxford English Dictionary gives the following first recorded use of "authoritarian":

1856 A. J. Davis Penetralia 129 Does any one believe that the Book is essential to Salvation? Yes; there are many externalists and authoritarians who think so.