Smithsonian Institution. (2004). Official guide to the Smithsonian National Museum of Natural History. Smithsonian Books.
Chicago Style (17th ed.) CitationSmithsonian Institution. Official Guide to the Smithsonian National Museum of Natural History. Washington [D.C.]: Smithsonian Books, 2004.
MLA (9th ed.) CitationSmithsonian Institution. Official Guide to the Smithsonian National Museum of Natural History. Smithsonian Books, 2004.
Warning: These citations may not always be 100% accurate.