Salvatore Settis (1990). Giorgione's Tempest: Interpreting the Hidden Subject. University of Chicago Press. p. 62, summarising this scholarly interpretation: "The lightning is Jove" cf. Peter Humfrey (1997). Painting in Renaissance Venice. Yale University Press. p. 118f.
Iūpiter is thought to be the historically older form and Iuppiter, to have arosen through the so-called littera-rule. Compare Weiss (2010). "Observations on the littera rule"(PDF). Cornell Phonetics Lab. Ithaca, NY: Cornell University. Archived from the original(PDF) on 17 October 2016.
Pépin, J. (1956). "La théologie tripartite de Varron". Revue des études augustiniennes. 2: 265–294. doi:10.1484/J.REA.5.103923. Dumézil has pointed out that even though Augustine may be correct in pointing out cases in which Varro presented under the civil theology category contents that may look to belong to mythic theology, nevertheless he preserved under this heading the lore and legends ancient Romans considered their own.
Iūpiter is thought to be the historically older form and Iuppiter, to have arosen through the so-called littera-rule. Compare Weiss (2010). "Observations on the littera rule"(PDF). Cornell Phonetics Lab. Ithaca, NY: Cornell University. Archived from the original(PDF) on 17 October 2016.