Cite

King Ferdinand Hohenzollern-Sigmaringen

MLA

Steinberg, Saul, 1914-1999. King Ferdinand Hohenzollern-Sigmaringen. Box 428, folder 5833. undated. https://collections.library.yale.edu/catalog/33488503.

APA, 6th edition

Steinberg, Saul, 1914-1999. (["Box 428, folder 5833"])(undated)[King Ferdinand Hohenzollern-Sigmaringen]. https://collections.library.yale.edu/catalog/33488503.