“The Elixir of Life; or, the Philosopher's Discovery. --A Holiday Fantasy.”
MLA
Hansen, Bert, 1944-. “The Elixir of Life; or, the Philosopher's Discovery. --A Holiday Fantasy.”. Box 10, folder 15. December 30, 1891. https://collections.library.yale.edu/catalog/32326698.
APA, 6th edition
Hansen, Bert, 1944-. (["Box 10, folder 15"])(December 30, 1891)[“The Elixir of Life; or, the Philosopher's Discovery. --A Holiday Fantasy.”]. https://collections.library.yale.edu/catalog/32326698.