APA (7th ed.) Citation

Bonjour, E., Offler, H. S., & Potter, G. R. (1985). A short history of Switzerland. Greenwood Press.

Chicago Style (17th ed.) Citation

Bonjour, Edgar, H. S. Offler, and G. R. Potter. A Short History of Switzerland. Westport, Conn.: Greenwood Press, 1985.

MLA (9th ed.) Citation

Bonjour, Edgar, et al. A Short History of Switzerland. Greenwood Press, 1985.