A Bibliography is a list of sources used as a reference for the writing of the book, thesis, paper or the like. The bibliographic entry has three main divisions, each followed by a period: the author's name reversed for alphabetizing, the title and the publication data.
Example of Bibliographic Entry
Dahl, Robert A.
A Preface to Democratic Theory. Chicago: University of Chicago Press, 1956.
For more examples, consult a MLA Handbook.