I've decided to work on some topics about supersymmetry for my undergraduate thesis. My background is that I have had a one-semester course in differentiable manifolds, plus typical undergrad math courses, real analysis and module theory (graduate algebra). So, I went to the library and found a book written by some famous mathematicians and physicists like Witten and Delign. It's called Quantum Fields and Strings: A course for mathematicians. I started reading the first two chapter. My main problem with the book is that it defines supermanifolds by sheaf of algebras and I don't know anything about sheaves or schemes and I don't have time to study algebraic geometry this semester. Is there a good book that covers general topics that students need to know about supersymmetry without using sheaves and schemes? What books do you think I should look at? Thanks in advance.