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Most Current Periodic Table
If you run into conflicting information, this is the most current periodic table published by the International Union of Pure and Applied Chemistry (IUPAC).
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Encyclopedia Britannica
This link can also be accessed by going to www.mel.org > eResources > Click on the "B" section > Britannica School. You can look at the middle school or high school level. This resource provides you with a cite button. Website > Webpage > Copy & Paste a citation.
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Chemical Elements eBook articles
This eBook source has a convenient cite button. Select Website > Book > Copy & Paste a citation.