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The phrase "a valid reference is needed" is correct and usable in written English.
You can use it when indicating that a legitimate source or citation is required for a particular context, such as academic writing or research.
Example: "In order to support your argument, a valid reference is needed to substantiate your claims."
Alternatives: "a legitimate citation is required" or "an appropriate reference is necessary."
Similar(60)
If so a reference is needed.
A minimum turnout of 50percentt of eligible voters casting a valid vote was needed for the vote to be valid.
A randomized controlled trial is needed for a valid answer to these questions.
Nevertheless, a valid treatment for DCM patients is needed.
To assess the quality of SP feedback, a valid and reliable assessment instrument is needed.
A system of revalidation is needed that is valid and reliable.
In the exercise domain, a valid form of exercise CE assessment is needed.
However, a rice reference gene was needed.
Thus a flexible multi-state model with random effects is needed to obtain valid outcome estimates.
A total of 948 valid signatures was needed.
To qualify for a spot on the ballot, 1,000 valid signatures are needed.
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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