MLA

Lavater, Johann Caspar, 1741-1801. Unidentified. Portfolio of portraits, unbound. 47 etchings with manuscript captions in the hand of Lavater interpreting facial expressions. Box 1, folder 16. undated. https://collections.library.yale.edu/catalog/10267709.

APA, 6th edition

Lavater, Johann Caspar, 1741-1801. (["Box 1, folder 16"])(undated)[Unidentified. Portfolio of portraits, unbound. 47 etchings with manuscript captions in the hand of Lavater interpreting facial expressions]. https://collections.library.yale.edu/catalog/10267709.