Cita APA (7th ed.)

Mitford, N., & Law, J. (1973). Frederick the Great: Nancy Mitford. Picture research by Joy Law. Penguin Books.

Cita Chicago (17th ed.)

Mitford, Nancy, i Joy Law. Frederick the Great: Nancy Mitford. Picture Research by Joy Law. Harmondsworth, Middlesex, England: Penguin Books, 1973.

Cita MLA (8th ed.)

Mitford, Nancy, i Joy Law. Frederick the Great: Nancy Mitford. Picture Research by Joy Law. Penguin Books, 1973.