MLA

Hansen, Bert, 1944-. "The Thoughtless Parent. His daughter (who is giving a fancy-dress ball) 'Oh, father, how could you! Why didn't you come in a disguise'?". Box 11, folder 24. 1908 December 16. https://collections.library.yale.edu/catalog/32326828.

APA, 6th edition

Hansen, Bert, 1944-. (["Box 11, folder 24"])(1908 December 16)["The Thoughtless Parent. His daughter (who is giving a fancy-dress ball) 'Oh, father, how could you! Why didn't you come in a disguise'?"]. https://collections.library.yale.edu/catalog/32326828.