APA استشهاد

Roberts, B. (1993). Biological weapons: Weapons of the future? 1993. Centre for strategic and International Studies.

استشهاد بنمط شيكاغو

Roberts, Brad. Biological Weapons: Weapons of the Future? 1993. Washington: Centre for strategic and International Studies, 1993.

MLA استشهاد

Roberts, Brad. Biological Weapons: Weapons of the Future? 1993. Centre for strategic and International Studies, 1993.