Romulo, C. P. (1971). In the mainstream of diplomacy. Office of Press and Public Affairs, Dept. of Foreign Affairs.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRomulo, Carlos Pena. In the Mainstream of Diplomacy. [Manila: Office of Press and Public Affairs, Dept. of Foreign Affairs, 1971.
एमएलए (9वां संस्करण) प्रशस्ति पत्रRomulo, Carlos Pena. In the Mainstream of Diplomacy. Office of Press and Public Affairs, Dept. of Foreign Affairs, 1971.
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