Read this excerpt from Narrative of the Life of Frederick Douglass, an American Slave.

My Dear Friend:

You remember the old fable of "The Man and the Lion," where the lion complained that he should not be so misrepresented "when the lions wrote history."
I am glad the time has come when the "lions write history.”
In this excerpt, the writer refers to a fable. When a writer refers to another piece of literature like this, it is called an _____.

allusion
allegory
alliteration
onomatopoeia