
personally i'd say:
L'autore come ottiene questo effetto?
or
Come ottiene questo effetto l'autore?
or
In che modo l'autore ottiene questo effetto?
(they can all be used as different translations to the original sentence)

more than two weeks without a reply, I changed it
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License: CC BY 2.0 FRLogs
This sentence was initially added as a translation of sentence #4831913
added by al_ex_an_der, January 14, 2016
linked by al_ex_an_der, January 14, 2016
linked by al_ex_an_der, January 14, 2016
edited by Guybrush88, January 31, 2016