Use web and subject specific encyclopedias to identify tales and tale types. These sources can help you understand context, key concepts, and identify readings that can help you to start to dig into your topic. Generally these sources are not things that you would site in your paper; they're intended as starting points.
The print resources here may make it easier for you to discover topics that had not already occurred to you as they present essays on a wide range of issues related to fairy tales in Europe (and elsehwere).
The Aarne-Thompson-Uther Classification of folk tales , which you've already been introduced to, can help you identify folk and fairy tales across cultures.
"There are many different folk tales in the world, but many tales are variations on a limited number of themes. The classification system originally designed by Aarne, and later revised first by Thompson and later by Uther, is intended to bring out the similarities between tales by grouping variants of the same tale under the same ATU category. "