IsotopeData is based on a wide range of sources, with enhancement at Wolfram Research by both human and algorithmic processing.

Atomic Mass Data Center. "NUBASE." 2003. »

Firestone, R. B. "The Berkeley Laboratory Isotopes Project's: Exploring the Table of Isotopes." 2000. »

Raghavan, P. "Table of Nuclear Moments." Atomic Data and Nuclear Data Tables 42, no. 2 (1989): 189-291.

Sansonetti, J. E. and W. C. Martin. "NIST Handbook of Basic Atomic Spectroscopic Data." 2005. »

United States National Institute of Standards and Technology. "Atomic Weights and Isotopic Compositions Elements." 2005. »

United States National Nuclear Data Center, Brookhaven National Laboratory. "Nuclear Wallet Cards" 2007. »

United States National Nuclear Data Center, Brookhaven National Laboratory. "NuDat 2.3." 2007. »