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McKellar, A. 1940. Evidence for the Molecular Origin of Some Hitherto Unidentified Interstellar Lines. Publications of the Astronomical Society of the Pacific. 52 (307): 187. Bibcode:1940PASP...52..187M. doi:10.1086/125159
S. Weinreb, A. H. Barrett, M. L. Meeks & J. C. Henry. 1963. Radio Observations of OH in the Interstellar Medium. Nature. 200 (4909): 829–831. Bibcode:1963Natur.200..829W. doi:10.1038/200829a0CS1 održavanje: više imena: authors list (link))
Lewis E. Snyder, David Buhl, B. Zuckerman, and Patrick Palmer. 1969. Microwave Detection of Interstellar Formaldehyde. Phys. Rev. Lett. 22 (13): 679–681. Bibcode:1969PhRvL..22..679S. doi:10.1103/PhysRevLett.22.679CS1 održavanje: više imena: authors list (link)
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Astrochemistry. www.cfa.harvard.edu/. 15. srpnja 2013. Inačica izvorne stranice arhivirana 20. studenoga 2016. Pristupljeno 20. studenoga 2016.