References!??

Question

What does this mean?

After a reference's first appearance, you may refer to the reference number.

Answer 1

Examples for subsequent notes

After fully documenting a work, you can use a shortened form in subsequent notes. The author's last name, followed by the relevant page numbers is usually enough:

13Viola 345-47

If you have cited two or more works by the same author, include a shortened form of the title in each reference after the first:

14Viola, Indian 278.

15Viola, Image 1-3.

Here is the source I used. It's a handy reference for citing different kinds of references.
Formatting Footnotes in MLA Style, http://fc.lovett.org/~rmartin/footnotes/