Cite

Esperanto language certificate

MLA

Pickens, William, 1881-1954. Esperanto language certificate. Box 6 (Oversize). 1906 1906. https://collections.library.yale.edu/catalog/17296908.

APA, 6th edition

Pickens, William, 1881-1954. (["Box 6 (Oversize)"])(1906 1906)[Esperanto language certificate]. https://collections.library.yale.edu/catalog/17296908.