Frohn, A., & Hope, A. (1989). Guide to Inventories and finding aids of german Archives: Axel Frohn. With the assistance of Anne Hope. : German Historical Institute.
Παραπομπή σε μορφή Chicago (17η εκδ.)Frohn, Axel, και Anne Hope. Guide to Inventories and Finding Aids of German Archives: Axel Frohn. With the Assistance of Anne Hope. Washington: : German Historical Institute, 1989.
Παραπομπή σε μορφή MLA (8th εκδ.)Frohn, Axel, και Anne Hope. Guide to Inventories and Finding Aids of German Archives: Axel Frohn. With the Assistance of Anne Hope. : German Historical Institute, 1989.
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