Here is the citation in MLA format:

"The Sea in Nineteenth-Century English and American Literature - Introduction." Nineteenth-Century Literary Criticism. Ed. Jessica Menzo Russel Whitaker. Vol. 104. Gale Cengage, 2002. eNotes.com. 2006. 3 Feb, 2010 <http://www.enotes.com/nineteenth-century-criticism/
sea-nineteenth-century-english-american>

At the top of every article enotes places a variety of icons. One of those says 'cite this'. It is just above the article title about the 3rd or 4th icon in.

Hope that helps.

Do make sure you are supposed to use MLA as opposed to APA or another citation format.