- ToxFAQs for Nickel This site on nickel, in a “frequently asked questions” format, was produced by the Agency for Toxic Substances and Disease Registry (ATSDR), a division of the U.S. Department of Health and Human Services.
- WebElements Periodic Table: Nickel Includes extensive information on the chemical properties of nickel, from the simple to the complex. Designed for students and for curious, somewhat science-savvy citizens.
- The Nickel Page Compiled by the Nickel Producers Environmental Research Association, or NiPERA, this site is intended to provide information on the use and properties of nickel and the safe use of nickel in the workplace.
- Nickel Statistics — USGS Minerals Information The United States Geological Survey provides this information page on nickel. The page provides a sound overview of the chemistry of nickel, and its ore types, consumption, and uses.