Küppers, P. E. Archivmaterialien zu Paul Erich Küppers, 1889-1922.
Chicago Style (17th ed.) CitationKüppers, Paul Erich. Archivmaterialien Zu Paul Erich Küppers, 1889-1922.
MLA (9th ed.) CitationKüppers, Paul Erich. Archivmaterialien Zu Paul Erich Küppers, 1889-1922.
Warning: These citations may not always be 100% accurate.