See this example properly formatted in the QUT Cite tool.
If you are simply referring to a map you can use a standard in-text citation examples as in Getting started - In-text citation.
Any reproduced map must reference the original author and copyright holder. Provide this information below the figure.
Note. From/Adapted from Title by A. A. Author, Year, Source.
Note. From Queensland 1: 25 000 series topographic map. 9543-22 Amity [Topographic map] by Department of Mapping and Surveying, 1986, Queensland Department of Mapping.
Note. Adapted from Ban Ban National Park [Topographic map] by QTopo, n.d., http://qtopo.dnrm.qld.gov.au/Mobile/
Map Company. (Year). Title [Map description]. Publisher.
Department of Mapping and Surveying. (1986). Queensland 1: 25 000 series topographic map. 9543-22 Amity [Topographic map]. Queensland Department of Mapping.
Map Company. (Year). Title [Map description]. Retrieved from http://xxxxxx
QTopo. (n.d.). Ban Ban National Park [Topographic map]. Queensland Government, QTopo. http://qtopo.dnrm.qld.gov.au/Mobile/
If the cartographer is indicated put that name in the first position in the format: Author, A. A.
If the map has no title provide a description of the map in square brackets.