ΕπικεφαλίδαSonntag, August χρησιμοποιείται σε: Integrated Authority File (GND), Germany
Πηγές
Βρίσκεται σεLCAuth. — Hamburgische Biografie 2: Personenlexikon
August Sonntag (1832-1860), astronomer of the 2nd Grinnell expedition 1853-1855 [Unknown authorUnknown author / Professor Sonntag's thrilling narrative of the Grinnell exploring expedition to the Arctic Ocean, in the years 1853, 1854, and 1855, in search of Sir John Franklin, under the command of Dr. E. K. Kane -- Public domain -- http://commons.wikimedia.org/wiki/File:August Sonntag.jpg]