MLA

Stenzel, Franz (1906-1998). [Sketchbook containing drawing of Cape Flattery and an ornament for a Native American canoe.] Pencil drawings, 20.5 x 27.4 cm.. Box 8, folder 157. n.d.. https://collections.library.yale.edu/catalog/2003274.

APA, 6th edition

Stenzel, Franz (1906-1998). (["Box 8, folder 157"])(n.d.)[[Sketchbook containing drawing of Cape Flattery and an ornament for a Native American canoe.] Pencil drawings, 20.5 x 27.4 cm.]. https://collections.library.yale.edu/catalog/2003274.