Petersen, A.K. 2008. From the Lost Teaching of Polycarp. Identifying Irenaeus’ Apostolic Presbyter and the Author of Ad Diognetum. Dansk Teologisk Tidsskrift. 71, 1 (mar. 2008), 60–61. DOI:https://doi.org/10.7146/dtt.v71i1.112100.