Engel, J. Archivmaterialien zu Josef Engel, 1922-1978.
Tohutoru Kātū Chicago (17th ed.)Engel, Josef. Archivmaterialien Zu Josef Engel, 1922-1978.
Tohutoro MLA (9th ed.)Engel, Josef. Archivmaterialien Zu Josef Engel, 1922-1978.
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