software) (德文) U-Boot Type XXI in detail, Essay with numerous photos of the WilhelmBauer attached. U-2540 gallery at uboat.net 维基共享资源上的相关多媒体资源:威廉·鲍姆号潜艇
Fahlbusch, Franz-Josef Hammerschmidt, Johannes Panten, Wilhelm Pickenhagen, Dietmar Schatkowski, , Kurt Bauer, Dorothea Garbe and Horst Surburg "Flavors and Fragrances"