MLA

Stieglitz, Alfred, 1864-1946. "Pen and Razor Blade," collage of metal, paper, crayon, ink, and paint on paper. Box 158, folder 2905. 1925. https://collections.library.yale.edu/catalog/2056817.

APA, 6th edition

Stieglitz, Alfred, 1864-1946. (["Box 158, folder 2905"])(1925)["Pen and Razor Blade," collage of metal, paper, crayon, ink, and paint on paper]. https://collections.library.yale.edu/catalog/2056817.