APA (7th ed.) Citation

Kahn, H., Brown, W., & Martel, L. (1976). The next 200 years. William Morrow.

Chicago Style (17th ed.) Citation

Kahn, Herman, William Brown, and Leon Martel. The Next 200 Years. New York: William Morrow, 1976.

MLA (9th ed.) Citation

Kahn, Herman, et al. The Next 200 Years. William Morrow, 1976.