MLA

Simpson, Randolph Linsly, 1927-1992. J. White & Co., Providence, RI Bust-length portrait of young man facing forward. Daguerreotype, ninth plate. Box 1, folder 12. undated. https://collections.library.yale.edu/catalog/2002074.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 1, folder 12"])(undated)[J. White & Co., Providence, RI Bust-length portrait of young man facing forward. Daguerreotype, ninth plate]. https://collections.library.yale.edu/catalog/2002074.