When I am citing books, do I cite the first edition, or the edition I am quoting?

For example, Tom Wolfe's The Electric Kool-Aid Acid Test was first published by Farrar, Strauss & Giroux in 1969, but the edition I read was published by Bantam House in 1999. In the research paper, do I cite the Bantam one or the original one? Preferably, using the Chicago Manual of Style. Thanks in advance.

You cite using the version you have, referring to the exact edition and publication. Why? One version might have larger font size, so you give a quote on page "X". It might be several pages before or after in the copy that a reviewer has access to.

So, if you are quoting from a First Edition Bible, Published by Rock, Hard, and Place in 125AD, First Printing, where it says Thou SHALT covet thy neighbour's wife, and you simple indicate "Bible; Rock, Hard & Place, 125AD" and the reviewer has the *corrected* version where is says Thou shalt NOT covet thy neighbour's wife, you'll be marked down, since he's using d different edition.

Good Luck!