APA

Puerto Rico, . (1960). Puerto Rico... a decade of progress. Washington, D.C: Association of sugar producers of Puerto Rico.

Chicago

Puerto Rico, . 1960. Puerto Rico... a decade of progress. Washington, D.C: Association of sugar producers of Puerto Rico.

Harvard

Puerto Rico, . (1960). Puerto Rico... a decade of progress. Washington, D.C: Association of sugar producers of Puerto Rico.

MLA

Puerto Rico, . Puerto Rico... a decade of progress. Washington, D.C: Association of sugar producers of Puerto Rico. 1960.