Ullrich, B., G. Tol, and T. de Haas. “An UMO Landed on the Via Appia. Results of the Minor Centres Project in the Pontine Plain, Lazio (Italy)”. Archaeologia Polona, vol. 53, Jan. 2015, pp. 389-92, https://journals.iaepan.pl/apolona/article/view/357.