ooh. interesting. I would probably recommend 'introducing feminism' if you want a very basic grounding of the movement; if you want a feminist fiction try Plath's Bell Jar, if you want a pretty good feminist polemic I'd recommend Female Chauvinist Pigs, else for a seminal text I'd say Vindication of the Rights of Women or The Female Eunuch (despite my own issues with Greer, she was a very important part of second-wave feminism).
if you want something totally mental, go with the SCUM manifesto - it's not very long, and is free online. Solanas was totally batshit mind, but I love her still.