Works Cited for Lydia Kim's Essay
Lydia Kim, Critical Essay on In Cold Blood, in Nonfiction Classics for Students, The Gale Group, 2001.
In text, just use Kim in signal phrase, or in parenthesis (skip the page numbers for now):
According to Kim, "Capote's sympathies for Smith are obvious."
We can clearly see, "Capote's sympathies for Smith are obvious" (Kim).