The sentinels of freedom :
the American people and the defense of the nation's secrets /
U.S. Department of Justice, Federal Bureau of Investigation.

APA Citation

United States. Federal Bureau of Investigation. (1987). The sentinels of freedom: the American people and the defense of the nation's secrets. [Washington, D.C.?]: The Bureau.

MLA Citation

United States. Federal Bureau of Investigation. The Sentinels of Freedom: the American People And the Defense of the Nation's Secrets. [Washington, D.C.?]: The Bureau, 1987.

Warning: These citations may not always be complete (especially for serials).