Richard Bauckham. (2009). [Review of] Charles E. Hill, From the Lost Teaching of Polycarp: Identifying Irenaeus’ Apostolic Presbyter and the Author of Ad Diognetum. The Journal of Theological Studies, Volume 60, Issue 2, October 2009, Pages 674–676, https://doi.org/10.1093/jts/flp055.
Foster, Paul (2007). "The Epistle to Diognetus". The Expository Times. 118 (4): 162–168. doi:10.1177/0014524606074317.