MLA

Simpson, Randolph Linsly, 1927-1992. Unknown photographer Three quarter length portrait, man seated holding book, right arm resting on column. Daguerreotype, ninth plate. Box 1, folder 10. 1858-59. https://collections.library.yale.edu/catalog/2002072.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 1, folder 10"])(1858-59)[Unknown photographer Three quarter length portrait, man seated holding book, right arm resting on column. Daguerreotype, ninth plate]. https://collections.library.yale.edu/catalog/2002072.