Ruben, P. Archivmaterialien zu Paul Ruben, 1866-1943.
Tohutoru Kātū Chicago (17th ed.)Ruben, Paul. Archivmaterialien Zu Paul Ruben, 1866-1943.
Tohutoro MLA (9th ed.)Ruben, Paul. Archivmaterialien Zu Paul Ruben, 1866-1943.
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