APA (7th ed.) Citation

Bell, B. (1961). Major flares and geomagnetic activity. Smithsonian Institution.

Chicago Style (17th ed.) Citation

Bell, Barbara. Major Flares and Geomagnetic Activity. Washington, D.C.: Smithsonian Institution, 1961.

MLA (9th ed.) Citation

Bell, Barbara. Major Flares and Geomagnetic Activity. Smithsonian Institution, 1961.