Frederick Christian Augustus Leopold Edward Harald von Schleswig-Holstein-Sonderburg-Augustenburg, Prince. geni_family_tree [online]. [cit. 2023-01-10]. Dostupné online.
Stillborn son of Schleswig-Holstein-Sonderburg-Augustenburg, Prince. geni_family_tree [online]. [cit. 2023-01-10]. Dostupné online.