Smithsonian Institution. Office of the Secretary, Abbot, C. G., & Freeman, H. B. (1929). Absorption lines of infra-red solar spectrum. [publisher not identified].
Chicago Style (17th ed.) CitationSmithsonian Institution. Office of the Secretary, C. G. Abbot, and H. B. Freeman. Absorption Lines of Infra-red Solar Spectrum. Washington, D.C.: [publisher not identified], 1929.
MLA (9th ed.) CitationSmithsonian Institution. Office of the Secretary, et al. Absorption Lines of Infra-red Solar Spectrum. [publisher not identified], 1929.
Warning: These citations may not always be 100% accurate.