"Dr. Guido Calza, archaeologist, 58; Excavator of Ostia, the Port of Rome, Dies -- Found Earliest Known Christian Church", New York Times Apr 24, 1946, p. 25.
Obituary by Herbert Bloch "In Memoriam Guido Calza (1888-1946)." American Journal of Archaeology 50 (1946), 407–408.