Isay, E. Archivmaterialien zu Ernst Isay, 1880-1943.
Tohutoru Kātū Chicago (17th ed.)Isay, Ernst. Archivmaterialien Zu Ernst Isay, 1880-1943.
Tohutoro MLA (9th ed.)Isay, Ernst. Archivmaterialien Zu Ernst Isay, 1880-1943.
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