Citing and Referencing Maps and Atlases
Cartographic Citations: A Style Guide. This printed guide by Christine Kollen, Wangyal Shawa, Mary Larsgaard is not available online but can be consulted in the Map Room [CUL classmark S696.c.201.9] or purchased.
ACLMA Guide. A comprehensive online guide from the Association of Canadian Map Libraries and Archives, and a guide upon which many other online citation guides are based.
Citing Maps. A comprehensive guide with annotated examples (citation diagrams) from Ohio Wesleyan University.
Other online citation guides - they may have useful examples: