Hagen, W. Archivmaterialien zu Walter Hagen, 1903-1980.
Tohutoru Kātū Chicago (17th ed.)Hagen, Walter. Archivmaterialien Zu Walter Hagen, 1903-1980.
Tohutoro MLA (9th ed.)Hagen, Walter. Archivmaterialien Zu Walter Hagen, 1903-1980.
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