MLA

Keegan, John. World Armies. 2nd ed. Detroit, Mich.: Gale Research Co., 1983.

APA

Keegan, J. (1983). World armies. 2nd ed. Detroit, Mich.: Gale Research Co.

Chicago

Keegan, John, World Armies. 2nd ed. Detroit, Mich.: Gale Research Co.,, 1983.