Eschen, F., & Krammer, M. (1956). Romantic Potsdam: 74 photographs ; [with an essay "Potsdam as a Cultural Concept" von Mario Krammer]. Arani-Verl.-Ges..
Lua i Stíl Chicago (17ú heag.)Eschen, Fritz, agus Mario Krammer. Romantic Potsdam: 74 Photographs ; [with an Essay "Potsdam as a Cultural Concept" Von Mario Krammer]. Berlin-Grunewald: Arani-Verl.-Ges., 1956.
Lua MLA (8ú heag.)Eschen, Fritz, agus Mario Krammer. Romantic Potsdam: 74 Photographs ; [with an Essay "Potsdam as a Cultural Concept" Von Mario Krammer]. Arani-Verl.-Ges., 1956.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.