APA (7th ed.) Citation

Strindberg, A., Eklund, T., & Sandbach, M. (1979). Inferno and From an occult diary. Penguin Books.

Chicago Style (17th ed.) Citation

Strindberg, August, Torsten Eklund, and Mary Sandbach. Inferno and From an Occult Diary. Harmondsworth: Penguin Books, 1979.

MLA (9th ed.) Citation

Strindberg, August, et al. Inferno and From an Occult Diary. Penguin Books, 1979.