MLA

ONE)1. Makes it easy to check sources
          2.Helps you relay information accurately with a familiar format
          3.Builds credibility
          4.Protects against plagiarism

TWO)  Helps information to be clear and understandable. Keeps track of sources.

THREE) From failing an assignment to be expelled from school.

FOUR) Web sites and text books.

FIVE) To list every source used and gives the needed info to locate and retrieve the sources