Rutgers,L.V.;van Strydonck,M.;Boudin,M.;van der Linde,C.(2009).«Stable isotope data from the early Christian catacombs of ancient Rome: new insights into the dietary habits of Rome's early Christians».Journal of Archaeological Science36(5): 1127–1134.doi:10.1016/j.jas.2008.12.015.ISSN0305-4403.
Rutgers,L.V.;van Strydonck,M.;Boudin,M.;van der Linde,C.(2009).«Stable isotope data from the early Christian catacombs of ancient Rome: new insights into the dietary habits of Rome's early Christians».Journal of Archaeological Science36(5): 1127–1134.doi:10.1016/j.jas.2008.12.015.ISSN0305-4403.