Start with the above two databases to search for articles, but don't limit yourself to just these two. These other database may provide useful articles and papers. Use some of the other subject specific databases available through the Library's Database menu.
Also look at the Journal links in my GIS subject guide for other journal and reference sources for GIS and cartography.
Journal titles SU currently subscribes to that are focused on cartography and mapping that can be searched in the "Journals" link from the Library's homepage.
There is also a Cartography subcategory listed under the Geography subject heading in the Earth & Environmental Sciences list found in the Library's Journals List. It will list all the journal titles that the library owns, or has access to, on cartography.
Here are a few book titles that provide excellent examples of cartographic styles. Also browse the Maps Ref collection, Atlas collection and the book stacks on the 3rd floor of Bird in the GA call number range for books that contain collections or carto-bibliographies of maps. These titles will have some excellent examples of cartographic style.