Pond-Ekberg Company
MLA
Dreier, Katherine S. (Katherine Sophie), 1877-1952. Pond-Ekberg Company. Box 29, folder 846-848. 1937-51, n.d.. https://collections.library.yale.edu/catalog/2040522.
APA, 6th edition
Dreier, Katherine S. (Katherine Sophie), 1877-1952. (["Box 29, folder 846-848"])(1937-51, n.d.)[Pond-Ekberg Company]. https://collections.library.yale.edu/catalog/2040522.