MLA:
* Fitzgerald, F. Scott. *The Great Gatsby*. Charles Scribner's Sons, 1925.
Chicago:
* Fitzgerald, F. Scott. *The Great Gatsby*. New York: Charles Scribner's Sons, 1925.
APA:
* Fitzgerald, F. S. (1925). *The Great Gatsby*. New York: Charles Scribner's Sons.
Note: If you are using a specific edition of the book, you should include that information in the citation. For example, if you are using the Norton Critical Edition, you would add that information after the title.
Here is a more detailed example using the MLA format, including a specific edition:
* Fitzgerald, F. Scott. *The Great Gatsby*. Edited by Matthew J. Bruccoli, Norton Critical Editions, W. W. Norton & Company, 2004.