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.
芝加哥风格引文United Nations. Technical Assistance Administration 与 Ricardo M. Ortiz. The Harbor System of El Salvador: Prepared for the Government of El Salvador by Ricardo M. Ortiz. New York, 1954.
MLA引文United Nations. Technical Assistance Administration 与 Ricardo M. Ortiz. The Harbor System of El Salvador: Prepared for the Government of El Salvador by Ricardo M. Ortiz. 1954.
警告：这些引文格式不一定是100％准确.