In printed format:
Last name XX, cartographer/Organization. Title [map]. Edition. Place of publication: Publisher; Year.
In electronic format:
Last name XX, cartographer/Organization. Title [map on the Internet]. Edition. Place of publication: Publisher; Year [cited year month day]. Available: URL
1. Fritz M, cartographer. Rwanda & Burundi scale 1:300,000 [map]. 5th ed. Vancouver, B.C.: ITMB Publishing, International Travel Maps; c2013.
2. U.S. Geological Survey. River basins of the United States: The Potomac [map on the Internet]. Denver: The Survey; c1994 [cited 2021 June 11]. Available: https://www.loc.gov/resource/g3792p.ct006457/?r=-0.13,-0.048,1.237,1.044,0
- Edition is specified from the second edition.
- If information about year of publication is missing you can use the copyright year instead with a "c" before it: c2007. If there is no copyright year either, write [no date].
- The date of retrieval should be stated for all electronic sources, in addition to the year of publication. This is written as shown above, in square brackets with the word "cited". The reason for this is that electronic sources may theoretically get edited and the information in them can then change. For this reason it is important to indicate at what time you studied an electronic source.