Shortened footnote and citation:
{{sfn | Böttcher | 2019 | p=}}
* {{cite book | last=Böttcher | first=Hans-Joachim | title=Ferdinand von Sachsen-Coburg und Gotha 1861-1948 | publisher=OEZ Verlag | publication-place=Berlin | date=2019 | isbn=978-3-89998-296-1 | language=de}}
Named reference:
<ref name="u424">{{cite book | last=Böttcher | first=Hans-Joachim | title=Ferdinand von Sachsen-Coburg und Gotha 1861-1948 | publisher=OEZ Verlag | publication-place=Berlin | date=2019 | isbn=978-3-89998-296-1 | language=de | page=}}</ref>