^{[citation needed]}

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Documentation for Cite

This template can be used to indicate that a particular statement or claim is unverified, and that it requires a source link to confirm.

Using {{cite}} at the end of a statement or sentence will generate the tag like this.^{[citation needed]}
The templates {{cit}}, {{citation needed}} and {{verify}} will also generate the tag.

Use it on claims that obviously require a source. In the below instance, a link to a blog post, press statement or other Valve announcement should be provided.

Valve has stated that enough potatoes could reboot GLaDOS earlier than originally planned.{{cite}}

However, do not use it on claims that are general game knowledge or would otherwise not require a proper citation.

The Handheld Portal Device has the ability to pick up and manipulate objects directly in front of it.{{cite}}

or

The Tyrant's Helm appears as a metal Viking helmet with two horns on its sides, the left of which is broken..{{cite}}