1. https://who.maps.arcgis.com/apps/opsdashboard/index.html#/345dfdc82b5c4f6a815f1d54a05d18ec (2020).
2. https://www.who.int/docs/default-source/wpro---documents/countries/viet-nam/covid-19/vnm-moh-who-covid-19-sitrep1.pdf?sfvrsn=87a79f0_2 (2020).
3. https://www.who.int/docs/default-source/wpro---documents/countries/viet-nam/covid-19/vnm-moh-who-covid-19-sitrep5.pdf?sfvrsn=54ef843f_2 (2020).
4. https://www.who.int/westernpacific/internal-publications-detail/covid-19-situation-report-for-the-western-pacific-region-17-19-august-2020---25-august-2020 (2020).
5. https://www.info.gov.hk/gia/general/202007/25/P2020072500716.htm; https://www.info.gov.hk/gia/general/202007/25/P2020072400826.htm (2020).