APA (7th ed.) Citation

Group Material (Firm : New York, N.Y.), Dia Art Foundation, & Wallis, B. (1990). Democracy: A project. Bay Press.

Chicago Style (17th ed.) Citation

Group Material (Firm : New York, N.Y.), Dia Art Foundation, and Brian Wallis. Democracy: A Project. Seattle: Bay Press, 1990.

MLA (8th ed.) Citation

Group Material (Firm : New York, N.Y.), et al. Democracy: A Project. Bay Press, 1990.