http://www3.humnet.unipi.it/galileo/fondazione/Vincitori%20Premio%20Galilei/Oskar_Kristeller.htm

http://findingaids.cul.columbia.edu/ead/nnc-rb/ldpd_4079550/summary

http://www.columbia.edu/cu/record/archives/vol20/vol20_iss30/record2030.16.html