APA

United States, . (2016). Carfentanil: a dangerous new factor in the U.S. opioid crisis. [Washington, D.C.]: Drug Enforcement Administration.

Chicago

United States, . 2016. Carfentanil: a dangerous new factor in the U.S. opioid crisis. [Washington, D.C.]: Drug Enforcement Administration.

Harvard

United States, . (2016). Carfentanil: a dangerous new factor in the U.S. opioid crisis. [Washington, D.C.]: Drug Enforcement Administration.

MLA

United States, . Carfentanil: a dangerous new factor in the U.S. opioid crisis. [Washington, D.C.]: Drug Enforcement Administration. 2016.