When entering a writing contest, do you have to list your sources?

I'm entering an article contest for my first time. The lady that runs this isn't friendly, and I would rather come up with the answer on my own (or with some friendly help;-). So, has anyone ever done this and do you need to list your sources? I have them, but would rather not send them if its not mandatory.

It doesn't tell me that I have to list these anywhere on the list of rules, but I don't want to not be considered because of leaving off the sources.

P.S. One of the reasons that I want to leave them off is that this woman's work is one of my sources, and no, I didn't plaguerize her.

Please, serious and courteous answers only. Thanks in advance!