Chesterfield, E. o., & Schumann, K. (1918). Letters to His Son. Tauchnitz.
Lua i Stíl Chicago (17ú heag.)Chesterfield, Earl of, agus Kurt Schumann. Letters to His Son. Leipzig: Tauchnitz, 1918.
Lua MLA (8ú heag.)Chesterfield, Earl of, agus Kurt Schumann. Letters to His Son. Tauchnitz, 1918.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.