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1 2 p. 376, E. Dorrit Hoffleit (2002). "Pioneering Women in the Spectral Classification of Stars". Physics in Perspective. 4: 370–398. Bibcode:2002PhP.....4..370H. doi:10.1007/s000160200001.
↑ Analyse spectrale de la lumière de quelques étoiles, et nouvelles observations sur les taches solaires, P. Secchi, Comptes Rendus des Séances de l'Académie des Sciences 63 (July–December 1866), pp. 364–368.
↑ Nouvelles recherches sur l'analyse spectrale de la lumière des étoiles, P. Secchi, Comptes Rendus des Séances de l'Académie des Sciences 63 (July–December 1866), pp. 621–628.
↑ Classification of Stellar Spectra: Some History
↑ pp. 62–63, Stars and Their Spectra: An Introduction to the Spectral Sequence, James B. Kaler, Cambridge: Cambridge University Press, 1997, ISBN 0-521-58570-8.
↑ Cannon, Annie Jump; Pickering, Edward Charles (1912), Annals of the Astronomical Observatory of Harvard College; vol. 56, no. 4, Cambridge, Mass.: The Observatory
↑ The Guinness book of astronomy facts & feats, Patrick Moore, 1992, 0-900424-76-1
↑ "The Colour of Stars". Australia Telescope Outreach and Education. 2004-12-21. Dicapai 2007-09-26. Check date values in: |date= (bantuan) — Explains the reason for the difference in color perception.
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Jaschek, Carlos (1990). The Classification of Stars (edisi 2nd edition). New York, NY: Cambridge University Press. ISBN 0-521-26773-0. Parameter |coauthors= tidak diketahui diabaikan (guna |author=) (bantuan)Selenggaraan CS1: Extra text (link)
Kaler, James B. (1989). Stars and Their Spectra: An Introduction to the Spectral Sequence. New York, NY: Cambridge University Press. ISBN 0-521-30494-6.

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