Peter J.P.J.MohrPeter J.P.J., Barry N.B.N.TaylorBarry N.B.N., David B.D.B.NewellDavid B.D.B., CODATA recommended values of the fundamental physical constants: 2006, „Reviews of Modern Physics”, 80 (2), 2008, s. 633–730, DOI: 10.1103/RevModPhys.80.633(ang.).