Verboven, K.; Laes, C. (2016) Work, labor and professions in the Roman World. Impact of Empire 23. Leiden: Brill.
Hekster, O.; Kaizer, T. (2011) Frontiers in the Roman World. Proceedings of the Ninth Workshop of the International Network Impact of Empire (Durham, 16?19 April 2009). Impact of Empire 13. Leiden: Brill.
Hekster, O.; De Kleijn, G. (2007) Crises and the Roman Empire: proceedings of the seventh workshop of the international network impact of Empire (Nijmegen, June 20-24, 2006). Impact of Empire. Leiden: Brill.