Thesis on manipulation in sShakespeare plays

Hey guys, i absolutely need help, i have to write a thesis paper on how characters in shakespeare's plays manipulate other. I have no idea what to write as my thesis statement and mainly, i need some sources, like substancial literary criticism sources that i just cannot find that talk specifically about how lady macbeth was manipulative, i need this sourse so i caN QOUTE FROM IT BE I CANNOT FIND A SOURCE FOR THIS (srry bout the caps) But can someone please help?

There was a quote in Act I, Scene 7 where Macbeth was going to pull out of the murder of the king and Lady Macbeth questioned his manhood in order to convince him to do it.
I dont' know if that's what you're looking for, but I thought of that and figured maybe it would help. Good luck!