Cite

"Rock of the Walkyries"

MLA

Appia, Adolphe, 1862-1928. "Rock of the Walkyries". Box 4 (Broadside). 1892. https://collections.library.yale.edu/catalog/10061347.

APA, 6th edition

Appia, Adolphe, 1862-1928. (["Box 4 (Broadside)"])(1892)["Rock of the Walkyries"]. https://collections.library.yale.edu/catalog/10061347.