APA

Puerto Rico, Sierra Berdecía F., .Protecting Puerto Rico's labor. Washington, D.C: Office of Puerto Rico.

Chicago

Puerto Rico, Sierra Berdecía Fernando, .Protecting Puerto Rico's labor. Washington, D.C: Office of Puerto Rico.

Harvard

Puerto Rico, Sierra Berdecía F., .Protecting Puerto Rico's labor. Washington, D.C: Office of Puerto Rico.

MLA

Puerto Rico, Sierra Berdecía Fernando, .Washington, D.C: Office of Puerto Rico. .