APA (7th ed.) Citation

Kallen. (2005). What are the most serious threats to national security? Thomson Gale.

Chicago Style (17th ed.) Citation

Kallen. What Are the Most Serious Threats to National Security? Farmington Hills: Thomson Gale, 2005.

MLA (9th ed.) Citation

Kallen. What Are the Most Serious Threats to National Security? Thomson Gale, 2005.

Warning: These citations may not always be 100% accurate.