APA

Chelala C. A., PAN AMERICAN HEALTH ORGANIZATION, . (1997). Violence in the Americas: the social pandemic of the 20th century. [Washington, D.C.]: Pan American Health Organization.

Chicago

Chelala César A, PAN AMERICAN HEALTH ORGANIZATION, . 1997. Violence in the Americas: the social pandemic of the 20th century. [Washington, D.C.]: Pan American Health Organization.

Harvard

Chelala C. A., PAN AMERICAN HEALTH ORGANIZATION, . (1997). Violence in the Americas: the social pandemic of the 20th century. [Washington, D.C.]: Pan American Health Organization.

MLA

Chelala César A, PAN AMERICAN HEALTH ORGANIZATION, . Violence in the Americas: the social pandemic of the 20th century. [Washington, D.C.]: Pan American Health Organization. 1997.