Füllkrug, G. Archivmaterialien zu Gerhard Füllkrug, 1870-1948.
Chicago Style (17th ed.) CitationFüllkrug, Gerhard. Archivmaterialien Zu Gerhard Füllkrug, 1870-1948.
MLA引文Füllkrug, Gerhard. Archivmaterialien Zu Gerhard Füllkrug, 1870-1948.
警告：這些引文格式不一定是100％准確.