Purdue University's OWL (Online Writing Lab) has easy-to-use online style guides for MLA, APA, and Chicago Style. These are a great place to start if you are looking for help with a particular citation style.
Each guide outlines basic rules for in-text citations, works cited lists, and bibliographies. This includes how to cite different kinds of books, journal articles, websites, videos, images, and much more.
Citing images correctly is just as important as citing written sources in your work. The following guides provide specific guidelines for citing images from some of the most common sources.
The library also holds print copies of the main style guides, which cover every aspect of each citation style. You may need these for information on how to cite sources not covered in the online guides, such as performances, or didactic panels in a museum exhibition.
MLA Handbook by 
The Chicago Manual of Style, 17th Edition by 
Publication Manual of the American Psychological Association by 
Elements of Indigenous style : a guide for writing by and about Indigenous peoples by How do I cite wall text accompanying artwork at a museum in MLA format?
To cite wall text, follow the MLA template of core elements. Provide a description of the wall text as the title of the source. This may include the title of the artwork the wall text explains and the artist who created it. If the work was part of an exhibit, include the exhibit’s name as the title of the container, followed by the date (opening and closing), and the museum and city as the location:
Wall text for A Warrior’s Story, Honoring Grandpa Blue Bird, by Lauren Good Day Giago. Unbound: Narrative Art of the Plains, 12 Mar.-4 Dec. 2016, National Museum of the American Indian, New York.
Wall text for central Caribbean tripod vessel in the form of a spectacled owl. Céramica de los Ancestros: Central America’s Past Revealed, 18 Apr. 2015-Dec. 2017, National Museum of the American Indian, New York
Wall text for jar with feathered serpent design. National Museum of the American Indian, New York.
For more information see:https://style.mla.org/citing-wall-text/
For further information about citing other art-related resources, you can search the MLA website: https://style.mla.org/?s=art