Gaya APA

Sivard, R, L. (1989). World military and social expenditures 1989 (13 th.ed.). Washington, D.C: World Prioritiees Inc..

Gaya MLA

Sivard, Ruth, Leger. "World military and social expenditures 1989". 13 th.ed. Washington, D.C: World Prioritiees Inc., 1989. Text.