This account is based on the review in Mohr, Peter J.; Taylor, Barry N. (1999). "CODATA recommended values of the fundamental physical constants: 1998". J. Phys. Chem. Ref. Data. 28 (6): 1713–1852. doi:10.1103/RevModPhys.72.351.
"Loschmidt on Molecular Size". web.archive.org. 2006-02-07. Archived from the original on 2006-02-07. Diakses tanggal 2020-09-05.Pemeliharaan CS1: Url tak layak (link)
webmineral.com
Mineralogy Database (2000–2005). "Unit Cell Formula". Diakses tanggal 2007-12-09.