Oddly Wired
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collaboration

You reject good ideas because you did not create them.

The 'not-invented-here' bias causes people to devalue external solutions in favor of internal ones.

Individuals and teams often show a preference for their own suboptimal solutions over superior external ones. The ego-investment in your own process blinds you to the effectiveness of alternatives.

Your ownership of an idea is often mistaken for its quality.

Where this comes from

Study
Katz and Allen, 1982, Not Invented Here Bias
What the check found
The claim is a well-established characterization of the NIH syndrome described by Katz and Allen, though the cited paper is titled 'Investigating the Not Invented Here (NIH) Syndrome'.
Confidence
Solid, with limits

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.