Sammartino, A. H. (2010). The impossible border: Germany and the east, 1914-1922. Cornell Univ. Press.
Lua i Stíl Chicago (17ú heag.)Sammartino, Annemarie H. The Impossible Border: Germany and the East, 1914-1922. Ithaca, New York: Cornell Univ. Press, 2010.
Lua MLA (8ú heag.)Sammartino, Annemarie H. The Impossible Border: Germany and the East, 1914-1922. Cornell Univ. Press, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.