- ^ Luigi Pirandello, "Henry IV: Followed by "The License," edited and Translated by Martha Witt and Mary Ann Frese Witt (New York: Italica Press, 2016), x.
- ^ "IBDB: The official source for Broadway Information". www.ibdb.com. Archived from the original on 2012-10-24.
- ^ Pirandello, 2016, p. xi.
- ^ Stoppard, Tom (2004). Pirandello's Henry IV. London: Faber and Faber. ISBN 0-571-22507-1. OCLC 57314471.
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