Common knowledge does not need a reference.

Although we recommend providing references for new or controversial information, we do not recommend providing references for common or widely accepted knowledge. We also do not recommend providing a reference for commonly accepted definitions or descriptions.

For example, you do not need to provide a reference for this information: “Clouds are formed from water molecules.” This is common knowledge.

You also would not need a reference for this information: “Books are composed of bound papers, which often contain words or images.”

Basically, if your readers already know, understand, and believe the information, you will not need a reference.

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This is the strategy for day 128 in 300 Days of Better Writing, available at Hostile Editing in PDF, Kindle, and paperback formats.

For a sample of 300 Days of Better Writing and other books by Precise Edit, download the free ebook.

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