APA (7th ed.) Citation

Heyman, N. M. (1997). World War I (1. publ.). Greenwood Press.

Chicago Style (17th ed.) Citation

Heyman, Neil M. World War I. 1. publ. Westport, Conn. [u.a.]: Greenwood Press, 1997.

MLA (9th ed.) Citation

Heyman, Neil M. World War I. 1. publ. Greenwood Press, 1997.