Bureau of Diplomatic Security. Political Violence Against Americans . Washington, GPO, 1999. Colombia, pp 3-6. Colombia, p 31-32.
Book call no.
The Americas , edited by Charles F. Bahmueller. Hackensack, NJ, Salem Press, 2000. Colombia, pp 195-204. Book call no. R 909.82 W9273 v.1 Document Library of Congress.