does anyone know how to internally document a source from an anthology-- not a book in MLA format?

This site will give you the MLA FORMAT. Go down to the part on Anthology documenting.

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I am asking you about the internal documentation though. The site you gave me only tells me about the documentation.

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This site will help with both what you need on the Works Cited page as well as the internal documentation.

Hold your cursor over the words CITING SOURCES in the left column; then choose Essay in a collection. Whatever the form of the work (story, essay, poem, etc.), this will work.

=)