APA

Puerto Rico, . (1972). Special report. San Juan, P. R: Ports authority.

Chicago

Puerto Rico, . 1972. Special report. San Juan, P. R: Ports authority.

Harvard

Puerto Rico, . (1972). Special report. San Juan, P. R: Ports authority.

MLA

Puerto Rico, . Special report. San Juan, P. R: Ports authority. 1972.