ΕπικεφαλίδαSpira, Petruccio, eredi χρησιμοποιείται σε: Central Institute for the Union Catalogue of Italian Libraries and for Bibliographic Information, Rome (Italy)
ΠαραλλαγήEredi di Pietro Spira [Πηγές: BOMES]
Haeredes Petri Spirae Nome su edizioni
Spira o Spera Giorgio e Petruccio e loro eredi [Πηγές: OLSIC]