„The Colour of Stars”. Australia Telescope Outreach and Education. 21. 12. 2004. Архивирано из оригинала 10. 03. 2012. г. Приступљено 26. 9. 2007.CS1 одржавање: Формат датума (веза) — Explains the reason for the difference in color perception.
Sota, A.; Maíz Apellániz, J.; Morrell, N. I.; Barbá, R. H.; Walborn, N. R.; et al. (март 2014). „The Galactic O-Star Spectroscopic Survey (GOSSS). II. Bright Southern Stars”. The Astrophysical Journal Supplement Series. 211 (1). 10. Bibcode:2014ApJS..211...10S. S2CID118847528. arXiv:1312.6222. doi:10.1088/0067-0049/211/1/10.CS1 одржавање: Формат датума (веза)
harvard.edu
adsabs.harvard.edu
Habets, G. M. H. J.; Heinze, J. R. W. (новембар 1981). „Empirical bolometric corrections for the main-sequence”. Astronomy and Astrophysics Supplement Series. 46: 193—237 (Tables VII and VIII). Bibcode:1981A&AS...46..193H.CS1 одржавање: Формат датума (веза) – Luminosities are derived from Mbol figures, using Mbol(☉)=4.75.
Sota, A.; Maíz Apellániz, J.; Morrell, N. I.; Barbá, R. H.; Walborn, N. R.; et al. (март 2014). „The Galactic O-Star Spectroscopic Survey (GOSSS). II. Bright Southern Stars”. The Astrophysical Journal Supplement Series. 211 (1). 10. Bibcode:2014ApJS..211...10S. S2CID118847528. arXiv:1312.6222. doi:10.1088/0067-0049/211/1/10.CS1 одржавање: Формат датума (веза)
psu.edu
e-education.psu.edu
Palma, Dr. Christopher (2016). „The Hertzsprung-Russell Diagram”. ASTRO 801: Planets, Stars, Galaxies, and the Universe. John A. Dutton e-Education Institute: College of Earth and Mineral Sciences: The Pennsylvania State University. Приступљено 2017-01-29. „The quantities that are easiest to measure... are color and magnitude, so most observers ... refer to the diagram as a 'Color–Magnitude diagram' or 'CMD' rather than an HR diagram.”
„The Colour of Stars”. Australia Telescope Outreach and Education. 21. 12. 2004. Архивирано из оригинала 10. 03. 2012. г. Приступљено 26. 9. 2007.CS1 одржавање: Формат датума (веза) — Explains the reason for the difference in color perception.