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Discover LudwigThe phrase "a key source" is correct and usable in written English.
It can be used to refer to an important or primary origin of information, data, or resources in various contexts, such as research, reporting, or analysis.
Example: "The study identified a key source of funding that significantly impacted the project's success."
Alternatives: "a primary source" or "an essential source."
Exact(59)
"They are a key source of demand for new development".
"He was certainly a key source for Sorkin," he said.
Work is also a key source of status and identity.
Families are a key source of capital, contacts and customers.
Akin also apparently lost a key source of funding.
Tamil Nadu, a vast state with an immensely rich religious cultural heritage, is a key source.
The first was to change taxation rules to permit venture capital, a key source of financing.
Captured oil fields have been a key source of funding for Isis.
Such perception gaps are a key source of disputes over China's policies in Tibet.
It would be a key source of the very definition of life.
Take managers of hedge funds, a key source of donations to candidate Obama in 2008.
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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