Burckhardt, C. J. (1966). Richelieu. Callwey.
Lua i Stíl Chicago (17ú heag.)Burckhardt, Carl Jacob. Richelieu. München: Callwey, 1966.
Lua MLA (8ú heag.)Burckhardt, Carl Jacob. Richelieu. Callwey, 1966.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.