Referencing tips for geospatial data and maps:
Brock University How to Reference Geospatial Data, Maps, Atlases, Air photos
Association of Canadian Map Libraries and Archives best citation practices
Harvard University Guidelines and tools for citing data
ArcGIS Online Basemap: http://support.esri.com/technical-article/000012040
Software version example:
ESRI 2019. ArcGIS Desktop: Release 10.8. Redlands, CA: Environmental Systems Research Institute.