Areference to another story or source within a written piece or speech is called a(n):
allusion
plagiarism
illusion
fable

I think the correct answer from the choices listed above is the first option. A reference to another story or source within a written piece or speech is called an allusion. It is a figure of speech that makes a reference to a place, person, or something that happened. Hope this answers the question. Have a nice day.

Must be negative.substance increases