In Artstor, look for "Cite" to get the citation:
Last Name, First Name. Title. Publication year. Name of Museum or Institution where artwork is displayed, Website URL, Date of Access.
URLs should not include http:// or https:// in your citation. Your professor may ask you to omit URLs for neatness.
Kandinsky, Vasily. Picture with an Archer. 1909. Museum of Modern Art, www.moma.org/collection/works/80104, Accessed 8 February 2019.
Last Name, First Name. Title. Publication year. Name of Museum or Institution where the artwork is displayed, Location of Museum/Institution, Name of Website where
artwork is displayed, website URL, Date of Access.
URLs should not include http:// or https:// in your citation. Your professor may ask you to omit URLs for neatness.
Klee, Paul. Twittering Machine. 1922. Museum of Modern Art, New York. The Artchive, www.artchive.com/artchive/K/klee/twittering_machine.jpg.html. 11 February 2019.
From North Carolina State University:
"Autism Fact Sheet." National Autism Association, 2020, nationalautismassociation.org/resources/autism-fact-sheet.
Kress, Brad. "Burkina Faso: Testing the Tradition of Circular Migration." Migration Policy Institute, 1 May 2006, www.migrationpolicy.org/article/burkina-faso-testing-tradition-circular-migration.