Petersen, Kirsten Elisa, and Lars Ladefoged. Youth in Gangs. What Do We Know – and What Don’t We Know? A Research Review of National and International Knowledge about Youth in Gangs. Rapporter. Aarhus, DK: Aarhus Universitet, 2018. Accessed November 16, 2025. https://openbooks.kb.dk/au/catalog/book/284.