MLA

Billings, Robert Charles, and Yale University. School of Medicine. Boston Medical Library Robert Charles Billings 1899 Fund. 0AD. https://collections.library.yale.edu/catalog/16788813.

APA, 6th edition

Billings, R. C., & of Medicine, Y. U. S. (0 C.E.). Boston Medical Library Robert Charles Billings 1899 Fund [Bookplates]. https://collections.library.yale.edu/catalog/16788813.