I've been reading a very interesting PhD thesis, and I would thus like to reference it in my work.
Unfortunately this bibtex segment didn't work with \cite{}, instead giving [?]:
@phdthesis{michael_power_1991,
title = {The Power of Two Choices in Randomized Load Balancing},
url = {http://www.eecs.harvard.edu/~michaelm/postscripts/mythesis.pdf},
school = {Harvard},
author = {Michael David Mitzenmacher},
year = {1991}
}
What am I doing wrong?

\citedid you run, in order latex bibtex latex latex to re-generate the bibliography? – David Carlisle Jul 11 '12 at 12:11