Ian Blair et al., ‘Wells and bucket-chains: unforeseen elements of water supply in early Roman London’, Britannia, 37 (2006).

Fagan, p. 188; Piers D. Mitchell, ‘Human parasites in the Roman world: health consequences of conquering an empire’, Parasitology, 144:1 (January 2017), 48–58; A. M. Devine, ‘The low birth-rate in ancient Rome: a possible contributing factor’, Rheinisches Museum für Philologie (1985), 313ff.