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The phrase "an essential source" is correct and usable in written English.
You can use it when referring to something that is crucial or necessary for obtaining information or resources.
Example: "The library is an essential source for research materials in our field of study."
Alternatives: "a vital resource" or "a key reference".
Exact(56)
These attributes make the book an essential source of information for anyone interested in birds.
Except that property taxes are an essential source of money for public schools.
They are an essential source of timely and reliable information for the public.
Cognitive processes related to schema acquisition comprise an essential source of demands in learning situations.
Moreover, inhomogeneities in the RF field are an essential source of error for quantitative MR spectroscopy.
The Virginia Company Archives is an essential source for the study of the Atlantic World and Early Colonial Period.
The Grammar is an essential source for the serious student of Norwegian, and for students of comparative linguistics.
The modeling results highlight the role of the local precipitation as an essential source of groundwater in the BJD.
Groundwater is an essential source of water in Arctic regions due to largely frozen surface water resources.
Similar(2)
BUSH: But nuclear power is going to be an essential source, in my judgment, of future electricity for the United States and places like China and India.
If this NATO is "an essential source of stability in an unpredictable world," heaven help us all.
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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