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.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUnited Nations. Technical Assistance Administration और Ricardo M. Ortiz. The Harbor System of El Salvador: Prepared for the Government of El Salvador by Ricardo M. Ortiz. New York, 1954.
एमएलए (9वां संस्करण) प्रशस्ति पत्रUnited Nations. Technical Assistance Administration और Ricardo M. Ortiz. The Harbor System of El Salvador: Prepared for the Government of El Salvador by Ricardo M. Ortiz. 1954.
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