Answer:
A reference to another story or source within a written piece or speech is called an allusion.
Explanation:
The allusion is a linguistic resource (rhetorical figure, form of language expression) that refers to something without mentioning it directly. It is done through the implication or the link that the sender makes from one object to another. The allusion, in this way, suggests or insinuates a meaning through the mention of certain features or properties.
The allusions serve to illustrate the idea that the issuer wants to communicate and have an aesthetic objective: they are a tool to beautify the speech.
In summary, the allusion is a rhetorical figure through which reference is made to some person, thing or idea without naming it, through words that make us think of it.
Then a reference to another story or source within a written piece or speech is called an allusion.
