The Smithsonian institution :
founded 1846 by James Smithson, an English chemist, for the increase and diffusion of knowledge among men.

APA Citation

Smithsonian Institution. (192). The Smithsonian institution: founded 1846 by James Smithson, an English chemist, for the increase and diffusion of knowledge among men. [Washington?.

MLA Citation

Smithsonian Institution. The Smithsonian Institution: Founded 1846 by James Smithson, an English Chemist, for the Increase And Diffusion of Knowledge Among Men. [Washington?, 192.

Warning: These citations may not always be complete (especially for serials).