Stahl, W., & Bertz, E. (1996). Eduard Bertz's Correspondence with Macmillan & Co. 1884-1908: Wulfhard Stahl.
Lua i Stíl Chicago (17ú heag.)Stahl, Wulfhard, agus Eduard Bertz. Eduard Bertz's Correspondence with Macmillan & Co. 1884-1908: Wulfhard Stahl. [s.l.], 1996.
Lua MLA (8ú heag.)Stahl, Wulfhard, agus Eduard Bertz. Eduard Bertz's Correspondence with Macmillan & Co. 1884-1908: Wulfhard Stahl. 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.