Standard industrial classification manual, 1972 : 1977 supplement
MLA
Standard Industrial Classification Manual, 1972: 1977 Supplement. [Washington]: Dept. of Commerce, Office of Federal Statistical Policy and Standards : for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1978
APA, 7th edition
(1978). Standard industrial classification manual, 1972: 1977 supplement. [Washington]: Dept. of Commerce, Office of Federal Statistical Policy and Standards : for sale by the Supt. of Docs., U.S. Govt. Print. Off
Chicago, 17th edition
Standard industrial classification manual, 1972: 1977 supplement. [Washington]: Dept. of Commerce, Office of Federal Statistical Policy and Standards : for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1978