APA (7th ed.) Citation

Keegan, J., Holmes, R., Gau, J., & Foresyth, F. (1985). Soldiers: A history of men in battle. H. Hamilton.

Chicago Style (17th ed.) Citation

Keegan, John, Richard Holmes, John Gau, and Frederic Foresyth. Soldiers: A History of Men in Battle. London: H. Hamilton, 1985.

MLA (8th ed.) Citation

Keegan, John, et al. Soldiers: A History of Men in Battle. H. Hamilton, 1985.