1. National lockdown: Stay at Home. GOV UK. cited 2021 Jan 30. Available form: https://www.gov.uk/guidance/national-lockdown-stay-at-home
2. Zaken M, Van A. Netherlands to remain in lockdown until at least 9 February inclusive – news item-Government.nl2021. cited 2021 Jan 30. available From: https://www.government.nl/latest/news/2021/01/12/netherlands-to-remain-in-lockdown-until-at-least-9-february-inclusive
3. Zimbabwe Extends Lockdown, Dusk-to-Dawn Curfew Amid Surge in COVID19 Cases. Voice of America – english. cited 2021 Jan 30. available From: https://www.voanews.com/covid-19-pandemic/zimbabwe-extends-lockdown-dusk-dawn-curfew-amid-surge-covid19-cases
4. Zero Covid: What It Means and How We Get There. People Profit 2020. cited 2021 Apr 19. available From: https://www.pbp.ie/zero-covid-what-it-means-and-how-we-get-there
5. January 2021 PW. Biden team says US travel restrictions will remain. Flight Glob. cited 2021 Jan 30. available From: https://www.flightglobal.com/safety/biden-team-says-us-travel-restrictions-will-remain/142027.article