APA (7th ed.) Citation

National Library of Medicine (U.S.). (1964). National Library of Medicine classification: A scheme for the shelf arrangement of books in the field of medicine and its related sciences (Third edition (with 1969 suppl. pages added).). The Library.

Chicago Style (17th ed.) Citation

National Library of Medicine (U.S.). National Library of Medicine Classification: A Scheme for the Shelf Arrangement of Books in the Field of Medicine and Its Related Sciences. Third edition (with 1969 suppl. pages added). Bethesda, Md.: The Library, 1964.

MLA (9th ed.) Citation

National Library of Medicine (U.S.). National Library of Medicine Classification: A Scheme for the Shelf Arrangement of Books in the Field of Medicine and Its Related Sciences. Third edition (with 1969 suppl. pages added). The Library, 1964.