To reference a map from Digimap use the Digimap guidelines.
You will need:
Format:
Author’s name, Initials (Year) Title of map, scale (Series). Place of publication: publisher.
Example:
Ordnance Survey (2015) Map of Isle of Wight, 1:25,000 (OS Explorer Map OL29). Southampton: Ordnance Survey.
In-text citation: (Ordnance Survey, 2015)
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