National Library of Medicine. (2019). Collection development guidelines of the National Library of Medicine. National Library of Medicine (US).
Chicago Style (17th ed.) CitationNational Library of Medicine. Collection Development Guidelines of the National Library of Medicine. Bethesda, MD: National Library of Medicine (US), 2019.
MLA (9th ed.) CitationNational Library of Medicine. Collection Development Guidelines of the National Library of Medicine. National Library of Medicine (US), 2019.
Warning: These citations may not always be 100% accurate.