Tunstall, B. (1938). William Pitt, Earl of Chatham. Hodder & Stoughton.
Lua i Stíl Chicago (17ú heag.)Tunstall, Brian. William Pitt, Earl of Chatham. London: Hodder & Stoughton, 1938.
Lua MLA (8ú heag.)Tunstall, Brian. William Pitt, Earl of Chatham. Hodder & Stoughton, 1938.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.