A booklet concerning the work of the Bureau of Investigation /
published for the information of peace officers and law-enforcement officials of the United States

APA Citation

United States. Federal Bureau of Investigation. (1929). A booklet concerning the work of the Bureau of Investigation. Washington: U.S. Govt. Print. Off..

MLA Citation

United States. Federal Bureau of Investigation. A Booklet Concerning the Work of the Bureau of Investigation. Washington: U.S. Govt. Print. Off., 1929.

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