Shortened footnote and citation:
{{sfn | Gregory | 2018 | p=}}
* {{cite book | last=Gregory | first=Don Allen | title=After Valkyrie | publisher=McFarland | publication-place=Jefferson, North Carolina | date=2018-11-08 | isbn=978-1-4766-7152-9}}
Named reference:
<ref name="g606">{{cite book | last=Gregory | first=Don Allen | title=After Valkyrie | publisher=McFarland | publication-place=Jefferson, North Carolina | date=2018-11-08 | isbn=978-1-4766-7152-9 | page=}}</ref>