Παραπομπή σε μορφή APA (7η εκδ.)

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.

Παραπομπή σε μορφή Chicago (17η εκδ.)

United Nations. Technical Assistance Administration και Ricardo M. Ortiz. The Harbor System of El Salvador: Prepared for the Government of El Salvador by Ricardo M. Ortiz. New York, 1954.

Παραπομπή σε μορφή MLA (9th εκδ.)

United Nations. Technical Assistance Administration και Ricardo M. Ortiz. The Harbor System of El Salvador: Prepared for the Government of El Salvador by Ricardo M. Ortiz. 1954.