Need help on English research ignment, help please.?

I'm doing a research ignment on a literary style of an author. I chose Edgar Allan Poe and his Gothic literary style. I'm having a hard time starting because I can't find any good reliable research websites. Can anyone help me find some websites that are "Academic Sources." Anything to do with the Gothic Literary style would be helpful as I have already found some sites with the biography of Poe. Thanks.