Ancestry.com, Germany, Lutheran Baptisms, Marriages, and Burials, 1500-1971 (Lehi, UT, USA, Ancestry.com Operations, Inc., 2016), Ancestry.com, Evangelische Kirche. Jerusalemskirche Berlin, Berlin, Brandenburg, Preußen, Taufe (Baptism), Y. 1850, Pg. 97, No. 166, entry to Herrmann Otto SOMMER. https://www.ancestry.com/discoveryui-content/view/3426162:61229.
Ancestry.com, Germany, Lutheran Baptisms, Marriages, and Burials, 1500-1971 (Lehi, UT, USA, Ancestry.com Operations, Inc., 2016), Ancestry.com, Staatliche Archivverwaltung Der Deutschen Demokratischen Republik, Evangelische Kirche. Magdalenenkirche Rixdorf (Neukölln), Neukölln, Brandenburg, Preußen, Heirat (Marriage), Y. 1874, Pg. 158, No. 19, entry to Hermann Otto SOMMER; Original data: Mikrofilm Sammlung. Familysearch.org. Originale: Lutherische Kirchenbücher, 1567-1945. Various sources. https://www.ancestry.com/discoveryui-content/view/2055065:61250.
Ancestry.com, Berlin, Germany, Marriages, 1874-1936 (Lehi, UT, USA, Ancestry.com Operations, Inc., 2014), Ancestry.com, Berlin, Berlin, Deutschland (Germany), Berlin Va, Marriage, Y. 1895, No. 138, entry to Hermann Otto SOMMER; Original data: Heiratsregister der Berliner Standesämter 1874 - 1936. Digital images. Landesarchiv, Berlin, Deutschland. https://www.ancestry.com/discoveryui-content/view/941686:2957.
Ancestry.com, Berlin, Germany, Marriages, 1874-1936 (Lehi, UT, USA, Ancestry.com Operations, Inc., 2014), Ancestry.com, Berlin, Berlin, Deutschland (Germany), Berlin VIIa, Marriage, Y. 1900, No. 844, entry to Hermann Otto SOMMER; Original data: Heiratsregister der Berliner Standesämter 1874 - 1936. Digital images. Landesarchiv, Berlin, Deutschland. https://www.ancestry.com/discoveryui-content/view/1189996:2957.
Ancestry.com, Berlin, Germany, Deaths, 1874-1955 (Lehi, UT, USA, Ancestry.com Operations, Inc., 2014), Ancestry.com, Berlin, Berlin, Deutschland (Germany), Berlin IVb, Death, Y. 1919, No. 828, entry to Otto Hermann SOMMER; Original data: Sterberegister der Berliner Standesämter 1874-1955. Digital images. Landesarchiv, Berlin, Deutschland. https://www.ancestry.com/discoveryui-content/view/909822:2958.
Ancestry.com, Berlin, Germany, Deaths, 1874-1955 (Lehi, UT, USA, Ancestry.com Operations, Inc., 2014), Ancestry.com, Berlin, Berlin, Deutschland (Germany), Berlin IVb, Death, Y. 1919, No. 828, entry to Otto Hermann SOMMER; Original data: Sterberegister der Berliner Standesämter 1874-1955. Digital images. Landesarchiv, Berlin, Deutschland. https://www.ancestry.com/discoveryui-content/view/188947707:2958.