For Barbara / A spring offering
MLA
Elmslie, Kenward. For Barbara / A Spring Offering. 1999. https://collections.library.yale.edu/catalog/2029133.
APA, 6th edition
Elmslie, K. (1999). For Barbara / A spring offering [Collages (visual works) (AAT), Greeting cards, Photocollages (Photographic compositions)]. https://collections.library.yale.edu/catalog/2029133.