Rupieper, H. J. (1979). Alanson B. Houghton: An American Ambassador in Germany, 1922-1925: Hermann J. Rupieper.
Lua i Stíl Chicago (17ú heag.)Rupieper, Hermann J. Alanson B. Houghton: An American Ambassador in Germany, 1922-1925: Hermann J. Rupieper. [s.l.], 1979.
Lua MLA (8ú heag.)Rupieper, Hermann J. Alanson B. Houghton: An American Ambassador in Germany, 1922-1925: Hermann J. Rupieper. 1979.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.