Read this excerpt from a works cited page for an informative essay.
Works Cited
Ferry, Christopher. Racial Change in Civil War America. New York: Sunspot Press, 2011. Print.
"Underground Railroad." World Book Online. 2012. Web. 20 December 2012.

Which best describes the two citations?
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The two citations indicate possible plagiarism by the essay writer.
The two citations make it difficult to know where to find the sources
The two citations provide information on how to locate the sources.
The two citations change the information in the writer's essay