Hennies, M. (2016). Was hätten wir getan?: Markus Lang 1877-1941 / Martina Hennies.
Lua i Stíl Chicago (17ú heag.)Hennies, Martina. Was Hätten Wir Getan?: Markus Lang 1877-1941 / Martina Hennies. Perleberg, 2016.
Lua MLA (8ú heag.)Hennies, Martina. Was Hätten Wir Getan?: Markus Lang 1877-1941 / Martina Hennies. 2016.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.