*{{ Cite book | year = 2018 | forfatterauthor = Berloco, Fabrizio |title = The Big Book of Italian Verbs: 900 Fully Conjugated Verbs in All Tenses. With IPA Transcription, 2nd Edition | isbn = 978-8894034813 | location = | publisher = Lengu | url = https://books.google.it/books?id=DYynDwAAQBAJ&pg=PA1#v=onepage&q&f=false | ref = fberloco2018 }}
*{{ Cite book |author = Serianni, Luca |forfatter2author2 = Castelvecchi, Alberto |utgivelsesår = 1997 | title = Italiano. Grammatica, sintassi, dubbi. | isbn = | location = Milan | publisher = Garzanti | url = | ref = serianni1997 }}
*{{ Cite book |author = Berruto, Gaetano |year = 1987 |title = Sociolinguistica dell'italiano contemporaneo | isbn = | location = Roma | publisher=Carocci| ref=fberruto1987}}
