APA (7th ed.) Citation

Illich, I., Gartner, A., Greer, C., & Riessman, F. (1973). After deschooling, what? Perennial Library.

Chicago Style (17th ed.) Citation

Illich, Ivan, Alan Gartner, Colin Greer, and Frank Riessman. After Deschooling, What? New York [etc.]: Perennial Library, 1973.

MLA (9th ed.) Citation

Illich, Ivan, et al. After Deschooling, What? Perennial Library, 1973.