APA

(198). 1987 economic census of outlying areas: geographic area, statistics/Puerto Rico. [Washington, D.C: .

Chicago

198. 1987 economic census of outlying areas: geographic area, statistics/Puerto Rico. [Washington, D.C: .

Harvard

(198). 1987 economic census of outlying areas: geographic area, statistics/Puerto Rico. [Washington, D.C: .

MLA

1987 economic census of outlying areas: geographic area, statistics/Puerto Rico. [Washington, D.C: . 198.