Cita APA (7a ed.)

Combs, C. C., & Combs, C. C. (1997). Terrorism in the twenty-first century. Prentice Hall.

Cita Chicago Style (17a ed.)

Combs, Cynthia C., y Cindy C. Combs. Terrorism in the Twenty-first Century. Upper Saddle River, N.J: Prentice Hall, 1997.

Cita MLA (8a ed.)

Combs, Cynthia C., y Cindy C. Combs. Terrorism in the Twenty-first Century. Prentice Hall, 1997.