County business patterns, Puerto Rico
MLA
County Business Patterns, Puerto Rico. Washington, D.C.: U.S. Dept. of Commerce, Bureau of the Census , 1981-
APA, 7th edition
(1981-). County business patterns, Puerto Rico. Washington, D.C.: U.S. Dept. of Commerce, Bureau of the Census
Chicago, 17th edition
County business patterns, Puerto Rico. Washington, D.C.: U.S. Dept. of Commerce, Bureau of the Census , 1981-