Official opinions of the Attorneys General of the United States :
advising the President and heads of departments, in relation to their official duties.

APA Citation

United States. Department of Justice. (1873). Official opinions of the Attorneys General of the United States: advising the President and heads of departments, in relation to their official duties. Washington, D.C.: G.P.O..

MLA Citation

United States. Department of Justice. Official Opinions of the Attorneys General of the United States: Advising the President And Heads of Departments, In Relation to Their Official Duties. Washington, D.C.: G.P.O., 1873.

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