Cite

George A. Kubler's notes on the Focillon method, January 5, 1940, page 2.

MLA

Kubler, Geore A. George A. Kubler's Notes on the Focillon Method, January 5, 1940, Page 2. 1940. https://collections.library.yale.edu/catalog/10020009.

APA, 6th edition

Kubler, G. A. (1940). George A. Kubler's notes on the Focillon method, January 5, 1940, page 2. [Paper]. https://collections.library.yale.edu/catalog/10020009.