APA (7th ed.) Citation

Riley, J., Longville, T., & Hölderlin, F. (1973). What I own. GR/EW Books.

Chicago Style (17th ed.) Citation

Riley, John, Tim Longville, and Friedrich Hölderlin. What I Own. [Staffordshire, England]: GR/EW Books, 1973.

MLA (9th ed.) Citation

Riley, John, et al. What I Own. GR/EW Books, 1973.