Cite

["J.R. Osgood & Co.: Dear Sirs..."], open letter, printed version, Leaflet Literature

MLA

Whitman, Walt, 1819-1892. ["J.R. Osgood & Co.: Dear Sirs..."], open letter, printed version, Leaflet Literature. Box 1, folder 54. n.d.. https://collections.library.yale.edu/catalog/2053688.

APA, 6th edition

Whitman, Walt, 1819-1892. (["Box 1, folder 54"])(n.d.)[["J.R. Osgood & Co.: Dear Sirs..."], open letter, printed version, Leaflet Literature]. https://collections.library.yale.edu/catalog/2053688.