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The phrase "are a good source" is correct and usable in written English.
You can use it when discussing the reliability or value of information, materials, or references in a specific context.
Example: "Books on nutrition are a good source of information for maintaining a healthy diet."
Alternatives: "are a reliable resource" or "provide valuable information."
Exact(60)
Milkmen are a good source of credit.
Careers fairs are a good source of willing listeners.
Lupins are a good source of protein, popular in livestock feed.
I suppose that the bones are a good source of calcium even though they're hollow.
Nuts are a good source of protein, and the fat in these foods promotes heart health.
Virginia bluebells bloom in early spring and are a good source of pollen, Dr. Chavarria said.
Potatoes are a good source of protein, starch, vitamins and nutrients like zinc and iron.
Employers are a good source too; try Accenture, Fast Stream and Deloitte.
Twisted fairytales are a good source of humour (I've done it myself).
They are a good source of calcium, magnesium, phosphorous, potassium, iron, folate and protein.
Flowers that pollinate, for example, are a good source of food for many insects.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com