You can read the excerpt from Smith's book here: http://www.sallybedellsmith.com/clinton-white-house/excerpt.php
Nussbaum's version of that story, whick is more colorful and detailed, can found here: http://www.abajournal.com/magazine/article/bernie_nussbaum
Correction: Bill was merely her boyfriend in 1974 and Nussbaum’s story supports the idea that Bill and Hill made a pact on the presidency while dating at Yale.
That link is gone