Cite

Las Casas, etc. [notes on early Spanish writings regarding Indian land rights]

MLA

Cohen, Felix S., 1907-1953. Las Casas, etc. [notes on early Spanish writings regarding Indian land rights]. Box 1, folder 1. 1940, n.d.. https://collections.library.yale.edu/catalog/17147609.

APA, 6th edition

Cohen, Felix S., 1907-1953. (["Box 1, folder 1"])(1940, n.d.)[Las Casas, etc. [notes on early Spanish writings regarding Indian land rights]]. https://collections.library.yale.edu/catalog/17147609.