APA

Barry S. L., . (2004). Official guide to the Smithsonian National Museum of Natural History. Washington, D.C: Smithsonian Books.

Chicago

Barry Sharon L, . 2004. Official guide to the Smithsonian National Museum of Natural History. Washington, D.C: Smithsonian Books.

Harvard

Barry S. L., . (2004). Official guide to the Smithsonian National Museum of Natural History. Washington, D.C: Smithsonian Books.

MLA

Barry Sharon L, . Official guide to the Smithsonian National Museum of Natural History. Washington, D.C: Smithsonian Books. 2004.