United Nations. Technical Assistance Administration & Ortiz, R. M. (1954). The harbor system of El Salvador: Prepared for the Government of El Salvador by Ricardo M. Ortiz.
Citazione stile Chigago Style (17a edizione)United Nations. Technical Assistance Administration e Ricardo M. Ortiz. The Harbor System of El Salvador: Prepared for the Government of El Salvador by Ricardo M. Ortiz. New York, 1954.
Citatione MLA (9a ed.)United Nations. Technical Assistance Administration e Ricardo M. Ortiz. The Harbor System of El Salvador: Prepared for the Government of El Salvador by Ricardo M. Ortiz. 1954.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.