APA (7 वां संस्करण) प्रशस्ति पत्र
Organisation for Economic Co-operation and Development. (1978). Oecd economic surveys: Portugal 1977. OECD Publishing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Organisation for Economic Co-operation and Development. Oecd Economic Surveys: Portugal 1977. Paris, France: OECD Publishing, 1978.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Organisation for Economic Co-operation and Development. Oecd Economic Surveys: Portugal 1977. OECD Publishing, 1978.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.