Coats of arms of the German family Göring (left) and the Swedish family <a href="https://en.wikipedia.org/wiki/Fock_family" class="extiw" title="w:Fock family">Fock</a> (right) on the letterhead of a letter from Hermann Göring to his mother-in-law, January 1926
Unknown author<span style="display: none;">Unknown author</span>
Wilamowitz-Moellendorff, Fanny von (1941). <i>Carin Göring.</i> Berlin: Warneck. Between p. 30 and 31.