1. Decay data from national nuclear data center at the brookhaven national laboratory in the US. NuDat 3. (n.d.). https://www.nndc.bnl.gov/nudat3/.
2. Table of Isotopes decay data. Lund University. Retrieved 13 October 2014. Decay Data Search. (n.d.). http://nucleardata.nuclear.lu.se/toi/.
3. Determination of 137Cs and 90Sr in calcareous soils: geographical distribution on the Island of Majorca;Gómez;Appl. Radiat. Isot.,1997
4. Toxicological Profile for Strontium Agency for Toxic Substances and Disease Registry,2004
5. Radiation Protection | US EPA". EPA,2012