There are quite a number of key literary terms and concepts out there, and we come across these unfamiliar terms quite frequently. This is a nice glossary to consult for reliable and useful information (much better than the Internet, which can be quite inconsistent!).
Abrams, Meyer H., and Geoffrey Galt. Harpham. A Glossary of Literary Terms. Tenth Edition ed. Boston, Mass. [u.a.: Thomson Wadsworth, 2012. Print.
If you happen to find a reliable Internet site, post it in the comments section below!