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The phrase "a primary source for" is grammatically correct and can be used in written English.
It is typically used to introduce or describe a source that is considered to be the most original or closest to the original information being discussed. This can be used in academic writing, research papers, or any other type of writing where sources are being cited and referenced. Example: The diary of Anne Frank is a primary source for understanding the perspective of a young Jewish girl during the Holocaust.
Exact(60)
Are you aware of how the paper's role as a primary source for students has changed?
He identified the gland, near the base of the throat, as a primary source for the body's defense mechanisms.
After being quoted in The Times, Mr. Zeltser became a primary source for others in the news media.
The latter effect is generally assumed to be a primary source for unusual signals obtained in DW studies31.
For many customers with a keen eye on style rather than fashion, vintage shops have been a primary source for one-off pieces.
"Talk is cheap; buildings are expensive," as he puts it, so bricks and mortar are as reliable a primary source for the historian as any written document.
Not long ago, Mr. Kelly noted, scientists were content with Web portals that provided journal articles, a primary source for keeping up in their fields.
He cites a recent shooting incident in a Wisconsin shopping mall where a teenage girl's tweets became a primary source for journalists.
An unmatchable back catalog could eventually make Google a primary source for digital versions of books, old and new, threatening other e-book stores.
Steve Swayne, in "How Sondheim Found His Sound," identifies Nystroem as a primary source for the songs "Too Many Mornings" and "Boca Raton".
"As these kids mature, networks are right in foreseeing that they're going to use the Internet as a primary source for TV programming".
More suggestions(15)
a key source for
a basic source for
a premier source for
a major source for
a leading source for
a primary justification for
a primary selection for
a primary influence for
a nonpartisan source for
a primary residence for
a primary candidate for
a rich source for
a primary destination for
a primary issue for
a primary target for
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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