* {{cite book | last=Gottfried | first=Martin | title=Balancing Act | publisher=Little Brown | publication-place=Boston New York, NY London | date=1999-01 | isbn=978-0-316-32225-6}}
<ref name="v610">{{cite book | last=Gottfried | first=Martin | title=Balancing Act | publisher=Little Brown | publication-place=Boston New York, NY London | date=1999-01 | isbn=978-0-316-32225-6 | page=}}</ref>