Philippines (Republic). Office of the President. Presidential Economic Staff. (1967). Economic report on the province of Ilocos Sur. The Office.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPhilippines (Republic). Office of the President. Presidential Economic Staff. Economic Report on the Province of Ilocos Sur. [Manila]: The Office, 1967.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPhilippines (Republic). Office of the President. Presidential Economic Staff. Economic Report on the Province of Ilocos Sur. The Office, 1967.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.