The title of Maya Angelou's autobiography I Know Why the Caged Bird Sings comes from a poem called "Sympathy" by Paul Laurence Dunbar, another African-American writer. Angelou references this poem, another literary work. When authors reference another literary work, it is called a(n)...
O personification
simile
foreshadowing
allusion
O analogy

Allusion

Explanation:

An allusion is a covert or indirect reference to something else. One author referencing another literary work like in the given case is an example of an allusion.

Personification is the attribution of human characteristics to something non-human.

A smile is a literary device used to compare two things. Unlike the metaphor, a simile uses words like and as.

Foreshadowing is a literary device in which the author gives the readers hints about what is going to take place later on in the story.

An analogy is a comparison of two different things based on the resemblance of one of their aspects.