Cite

"Get After The Substance, Not The Shadow."

MLA

Hansen, Bert, 1944-. "Get After The Substance, Not The Shadow.". Box 12, folder 2. 1910 November 2. https://collections.library.yale.edu/catalog/32325808.

APA, 6th edition

Hansen, Bert, 1944-. (["Box 12, folder 2"])(1910 November 2)["Get After The Substance, Not The Shadow."]. https://collections.library.yale.edu/catalog/32325808.