APA (7th ed.) Citation

Smithsonian Institution. (1945). The solar constant and sunspot numbers. [s.n.].

Chicago Style (17th ed.) Citation

Smithsonian Institution. The Solar Constant and Sunspot Numbers. [Washington]: [s.n.], 1945.

MLA (9th ed.) Citation

Smithsonian Institution. The Solar Constant and Sunspot Numbers. [s.n.], 1945.