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The phrase "a single reference" is correct and usable in written English.
You can use it when discussing a specific source of information or citation in academic or professional contexts.
Example: "In my research paper, I relied on a single reference to support my argument about climate change."
Alternatives: "one source" or "a sole citation".
Exact(59)
Likewise, Reuters didn't carry a single reference to the event.
Not a single reference to holding one's nose or the lesser of two evils.
I can see not a single reference to the 20th century in his entire output.
"Really?" A thorough Google search fails to unearth a single reference to it.
Corridos began to appear in northern Mexico in the eighteen-sixties and have a single reference, the border.
So why is it that there is not a single reference to the book's editor in Kirn's entire review?
There is not a single reference to the slush-fund scandal that has been her lowest point as speaker.
The people who launched it were visionaries, yet there is not even a single reference to the program or its founders on any search engine I tried.
The president was harshly criticised by the opposition for not making a single reference to inflation in her three-hour speech to Congress.
"My brother was reading Faulkner at an early age, but other than that I don't think a single reference to Faulkner has ever been made in my family".
A single reference to Eudora Welty was the only acknowledgment that women in the US have ever had anything to do with the world of letters.
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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