قالب:AtWt IAV
Coplen, T. B. (2002), "Isotopic Abundance Variations of Selected Elements", Pure and Applied Chemistry 74 (10): 1987–2017, doi:, http://www.iupac.org/publications/pac/2002/pdf/7410x1987.pdf
Coplen, T. B. (2002), "Isotopic Abundance Variations of Selected Elements", Pure and Applied Chemistry 74 (10): 1987–2017, doi:10.1351/pac200274101987, http://www.iupac.org/publications/pac/2002/pdf/7410x1987.pdf