Helen E. Purkitt

• Annual Editions
• South Africa's weapons of mass destruction
• South Africa's Weapons of Mass Destruction
• World Politics
• World politics 2002/2003
• World politics 97/98
• World Politics 99/00 (World Politics, 1999-2000)
• World Politics, 1996-1997
• Biowarfare Lessons, Emerging Biosecurity Issues, and Ways to Monitor Dual-Use Biotechnology Trends in the Future
• World politics 94/95