{{sfn | Jensen | Wirth | Mickel | 1991 | p=}}

* {{cite book | last=Jensen | first=Kathleen | last2=Wirth | first2=Niklaus | last3=Mickel | first3=Andrew B. | title=Pascal User Manual and Report | publisher=Springer | publication-place=New York Heidelberg | date=1991 | isbn=3-540-97649-3}}

<ref name="k555">{{cite book | last=Jensen | first=Kathleen | last2=Wirth | first2=Niklaus | last3=Mickel | first3=Andrew B. | title=Pascal User Manual and Report | publisher=Springer | publication-place=New York Heidelberg | date=1991 | isbn=3-540-97649-3 | page=}}</ref>