{{sfn | Ritz | 1985 | p=}}

* {{cite book | last=Ritz | first=David | title=Divided Soul | publisher=McGraw-Hill Companies | date=1985 | isbn=0-07-052929-9}}

<ref name="m278">{{cite book | last=Ritz | first=David | title=Divided Soul | publisher=McGraw-Hill Companies | date=1985 | isbn=0-07-052929-9 | page=}}</ref>