1. United Nations. International Migration 2020 Highlights. 2021a (https://www.un.org/en/desa/international-migration-2020-highlights) Accessed 7 February 2021
2. International Organization for Migration. World Migration Report 2010. 2010 (https://publications.iom.int/system/files/pdf/wmr_2010_english.pdf). Accessed 14 February 2021
3. European Commission. Irregular migration. (https://ec.europa.eu/home-affairs/what-we-do/networks/european_migration_network/glossary_search/irregular-migration_en). Accessed 5 December 2020
4. Migration Data Portal. Irregular migration. (https://migrationdataportal.org/themes/irregular-migration). Accessed 20 March 2021.
5. International Organization for Migration. World Migration Report 2020. 2019 (https://publications.iom.int/system/files/pdf/wmr_2020.pdf). Accessed 5 February 2021