Cite the source dataset as
Kortmann, Bernd & Lunkenheimer, Kerstin & Ehret, Katharina (eds.) 2020. The Electronic World Atlas of Varieties of English. Jena: Max Planck Institute for the Science of Human History. (Available online at https://ewave-atlas.org)
This dataset is licensed under a CC-BY-3.0 license
Available online at https://ewave-atlas.org/