APA (7th ed.) Citation

Goebbels, J., Trevor-Roper, H. R., & Barry, R. (1979). The Goebbels diaries: The last days. Pan Books.

Chicago Style (17th ed.) Citation

Goebbels, Joseph, Hugh R. Trevor-Roper, and Richard Barry. The Goebbels Diaries: The Last Days. London: Pan Books, 1979.

MLA (8th ed.) Citation

Goebbels, Joseph, et al. The Goebbels Diaries: The Last Days. Pan Books, 1979.