found: Chiapparini, G. Il principe ereditario, 1927.
found: Speroni, G. Umberto II, 1992:p. 349 (d. March 18, 1983)
found: Il re signore, 1998:t.p. (Umberto di Savoia) p. 12 (b. Sept. 15, 1904) p. 599 (d. March 18, 1983)
found: I 36 giorni del Re di maggio, c2005:t.p. (Umberto II di Savoia; Umberto II of Savoy)
found: Britannica online, July 24, 2008(Umberto II; b. Sept. 15, 1904, Racconigi, Italy; d. Mar. 18, 1983, Geneva; briefly king of Italy in 1946; banished June 14, 1946; took residence in Cascais, Portugal, under the title Count of Sarre)
found: Wikipedia WWW site, July 24, 2008(Umberto II, occasionally anglicized as Humbert II; b. Sept. 15, 1904, Racconigi, Italy; d. Mar. 18, 1983, Geneva; King of Italy, May 9-June 12, 1946)
found: LCDG classification schedule, July 24, 2008(Umberto II)
found: La solitudine del re, 2019:title page (epistolario tra il Re Umberto II di Savoia ...)