MLA

Hughes, Langston, 1902-1967. Printed poems. Removed from: Alberti, De un Momento a Otro: Ediciones Europa-America, 1937. Box 581, folder 13815. n.d.. https://collections.library.yale.edu/catalog/17034218.

APA, 6th edition

Hughes, Langston, 1902-1967. (["Box 581, folder 13815"])(n.d.)[Printed poems. Removed from: Alberti, De un Momento a Otro: Ediciones Europa-America, 1937]. https://collections.library.yale.edu/catalog/17034218.