Frey, K. Archivmaterialien zu Karl Frey, 1942-2005.
Tohutoru Kātū Chicago (17th ed.)Frey, Karl. Archivmaterialien Zu Karl Frey, 1942-2005.
Tohutoro MLA (9th ed.)Frey, Karl. Archivmaterialien Zu Karl Frey, 1942-2005.
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