"Single" vs. "Only"

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ZOEYW

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Hello there,

I am a little bit confused about the two terms when being used in the situation:" This literature is the single source of ABC authoritative rules by local government." VS." This literature is the only source of ABC authoritative rules by local government."

What is the difference between the sentences by changing the terms?

Thanks,
 

MikeNewYork

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No difference.
 
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