APA (7th ed.) Citation

Smithsonian Institution. Office of the Secretary, Abbot, L. H., & Moore, A. F. (1920). Brightness of sky. [publisher not identified].

Chicago Style (17th ed.) Citation

Smithsonian Institution. Office of the Secretary, L. H. Abbot, and A. F. Moore. Brightness of Sky. Washington, D.C.: [publisher not identified], 1920.

MLA (9th ed.) Citation

Smithsonian Institution. Office of the Secretary, et al. Brightness of Sky. [publisher not identified], 1920.