MLA

The Bookman Portfolio: Containing Plates in Colour by Jessie Wilcox Smith Illustrating The Water Babies, by Charles Kingsley. 1920. https://collections.library.yale.edu/catalog/2039716.

APA, 6th edition

The Bookman Portfolio: containing plates in colour by Jessie Wilcox Smith illustrating The Water Babies, by Charles Kingsley. (1920). [Children's literature, Covers (Illustrations), Little magazines, Magazine covers, Prints (Visual works)]. https://collections.library.yale.edu/catalog/2039716.