APA (7th ed.) Citation

MARRION, EMBLETON, & FOSTER. (1978). The British army 1914-1918. Osprey Publ.

Chicago Style (17th ed.) Citation

MARRION, EMBLETON, and FOSTER. The British Army 1914-1918. London: Osprey Publ, 1978.

MLA (8th ed.) Citation

MARRION, et al. The British Army 1914-1918. Osprey Publ, 1978.