Cite

ALS, to Johann Heinrich Meyer

MLA

Speck, William A. (William Alfred), 1864-1928. ALS, to Johann Heinrich Meyer. Box 9, folder 288. n.d.. https://collections.library.yale.edu/catalog/2005318.

APA, 6th edition

Speck, William A. (William Alfred), 1864-1928. (["Box 9, folder 288"])(n.d.)[ALS, to Johann Heinrich Meyer]. https://collections.library.yale.edu/catalog/2005318.