Hellinghaus, O. Archivmaterialien zu Otto Hellinghaus, 1853-1935.
Chicago Style (17th ed.) CitationHellinghaus, Otto. Archivmaterialien Zu Otto Hellinghaus, 1853-1935.
MLA (9th ed.) CitationHellinghaus, Otto. Archivmaterialien Zu Otto Hellinghaus, 1853-1935.
Warning: These citations may not always be 100% accurate.