1. Acevedo, C., M. Hernández, W. Pleitez, F. Lazo, O. Cabrera, T. Yamagiwa, C. Lazo, R. Pineda, and C. Antonio “Partnership For Growth: El Salvador: Constraints Analysis.” San Salvador, El Salvador, 2011. https://pdf.usaid.gov/pdf_docs/pnaeb762.pdf
2. Taxation and evasion in the presence of extortion by organized crime
3. Crime and plural orders in Rio de Janeiro, Brazil
4. Avelar, B. “La Ruta De Buses Que Institucionalizó La Extorsión - Revista Factum.” Revista Factum, November 12, 2016. https://www.revistafactum.com/la-ruta-de-buses-que-institucionalizo-la-extorsion/.
5. Gang change and evolutionary theory