Hawkes SJ: Semimetallicity. Journal of Chemical Education, 2001, 78. vsk, nro 12, s. 1686–7. doi:10.1021/ed078p1686.
Vernon RE: Which Elements are Metalloids?. Journal of Chemical Education, 2013, 90. vsk, nro 12, s. 1703–7. doi:10.1021/ed3008457.
hbcpnetbase.com
Lide, D. R. ed.: CRC Handbook of Chemistry and Physics, Internet Version, s. 4–6, 4–28 – 4–29, 4–135, 12–206. CRC Press, 2005. Teoksen verkkoversio. (Arkistoitu – Internet Archive)
knovel.com
app.knovel.com
Greenwood, N.N. Earnshaw, A.: Chemistry of the Elements (2nd Edition)., s. 144–145, 330–335. Elsevier, 1997. Teoksen verkkoversio.
Lide, D. R. ed.: CRC Handbook of Chemistry and Physics, Internet Version, s. 4–6, 4–28 – 4–29, 4–135, 12–206. CRC Press, 2005. Teoksen verkkoversio. (Arkistoitu – Internet Archive)