Photoelectric Spectrometry Group. (1949). Photoelectric Spectrometry Group bulletin. [The Group].
Chicago Style (17th ed.) CitationPhotoelectric Spectrometry Group. Photoelectric Spectrometry Group Bulletin. [Cambridge, England]: [The Group], 1949.
MLA (8th ed.) CitationPhotoelectric Spectrometry Group. Photoelectric Spectrometry Group Bulletin. [The Group], 1949.
Warning: These citations may not always be 100% accurate.