Areference in a text to another well known text person event or thing is called an?

A reference in a text to another well known person event or thing is called ? A or An Allusion

Answer;
Allusion. 
 
Explanation; 
An allusion is a reference to a statement, person, place, event, or thing well known from literature, history, religion, etc. We can have three types of Allusion, literary allusion, historical allusion and classical allusion. Literary allusion is a reference to a person, place, or thing from previous literature; The three most popular sources: Bible, Shakespeare, & mythology.