APA (7th ed.) Citation

National Trust (Great Britain), Fedden, R., & Joekes, R. (1976). Treasures of the National Trust. J. Cape.

Chicago Style (17th ed.) Citation

National Trust (Great Britain), Robin Fedden, and Rosemary Joekes. Treasures of the National Trust. London: J. Cape, 1976.

MLA (9th ed.) Citation

National Trust (Great Britain), et al. Treasures of the National Trust. J. Cape, 1976.