Mitford, N., & Law, J. (1973). Frederick the Great: Nancy Mitford. Picture research by Joy Law. Penguin Books.
Lua i Stíl Chicago (17ú heag.)Mitford, Nancy, agus Joy Law. Frederick the Great: Nancy Mitford. Picture Research by Joy Law. Harmondsworth, Middlesex, England: Penguin Books, 1973.
Lua MLA (8ú heag.)Mitford, Nancy, agus Joy Law. Frederick the Great: Nancy Mitford. Picture Research by Joy Law. Penguin Books, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.