Treehouse of Horror IV (Spanish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Treehouse of Horror IV" in Spanish language version.

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archive.org

Richmond, Ray; Antonia Coffman (1997). The Simpsons: A Complete Guide to our Favorite Family. Harper Collins Publishers. pp. 124-125. ISBN 0-00-638898-1.

bbc.co.uk

Martyn, Warren; Wood, Adrian (2000). «Treehouse of Horror IV». BBC. Consultado el 21 de marzo de 2007.