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Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209
Cox, Arthur N.; Becker, Stephen A.; Pesnell, W. Dean, "Chapter 20. Theoretical Stellar Evolution", Allen's astrophysical quantities(PDF) (Edisi 4th), New York: Springer, hlm. 516, ISBN0-387-98746-0, diarsipkan dari asli(PDF) tanggal 2016-03-04, diakses tanggal 2012-01-25 See table 20.5
Cox, Arthur N.; Becker, Stephen A.; Pesnell, W. Dean, "Chapter 20. Theoretical Stellar Evolution", Allen's astrophysical quantities(PDF) (Edisi 4th), New York: Springer, hlm. 516, ISBN0-387-98746-0, diarsipkan dari asli(PDF) tanggal 2016-03-04, diakses tanggal 2012-01-25 See table 20.5