Cite

[Horned animal 'about the size of a bullock'] [art original].

MLA

[Horned Animal 'about the Size of a Bullock'] [Art Original]. 0AD. https://collections.library.yale.edu/catalog/16193657.

APA, 6th edition

[Horned animal 'about the size of a bullock'] [art original]. (0 C.E.). [Early works to 1800, Watercolors British 18th century, Watermarks (Paper) J. Whatman]. https://collections.library.yale.edu/catalog/16193657.