APA

Puerto Rico, . (1979). Retail food price differential and supermarket cost / price margins: a comparison between Puerto Rico and the United States. Mayagüez, P.R: .

Chicago

Puerto Rico, . 1979. Retail food price differential and supermarket cost / price margins: a comparison between Puerto Rico and the United States. Mayagüez, P.R: .

Harvard

Puerto Rico, . (1979). Retail food price differential and supermarket cost / price margins: a comparison between Puerto Rico and the United States. Mayagüez, P.R: .

MLA

Puerto Rico, . Retail food price differential and supermarket cost / price margins: a comparison between Puerto Rico and the United States. Mayagüez, P.R: . 1979.