1. David. L.R. (2004) CRC Handbook of Chemistry and Physics. Boca Raton: CRC Press. pp. 4-28.
2. Emsley (2001), p. 497.
3. Hammond, C.R. (1985) “Yttrium” (PDF). The Elements. Fermi National Accelerator Laboratory. Pp, 4-33. Archived from the original (PDF) on 2008, Retrieved 2008.
4. Lenntech contributors. “Yttrium”. Lenntech. Retrieved 2008.
5. National Cotton Council of America (1991), Proceedings.