'County lines': an exploratory analysis of migrating drug gang offenders in North Essex.
Thesis - Hallworth, J. 2016. MSc thesis, University of Cambridge.
Changing shape of street-level heroin and crack supply in England: commuting, holidaying and cuckooing drug dealers across ‘county lines’.
Article - Coomber, R. and Moyle, L.
British Journal of Criminology. 2018, Vol. 58 no. 6, p.1323-1342.