[2 pencil sketches]
MLA
Goulding, William R. [2 Pencil Sketches]. 0AD. https://collections.library.yale.edu/catalog/16574169.
APA, 6th edition
Goulding, W. R. (0 C.E.). [2 pencil sketches] [Account books--United States., Drawings, Memoirs--United States., Sketches]. https://collections.library.yale.edu/catalog/16574169.