World Health Organization. (1987). Vaccination certificate requirements and health advice for international travel: Situation as on 1 January 1987. World Health Organization WHO Publications Centre USA [distributor].
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWorld Health Organization. Vaccination Certificate Requirements and Health Advice for International Travel: Situation as on 1 January 1987. Geneva, Albany, NY: World Health Organization WHO Publications Centre USA [distributor], 1987.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWorld Health Organization. Vaccination Certificate Requirements and Health Advice for International Travel: Situation as on 1 January 1987. World Health Organization WHO Publications Centre USA [distributor], 1987.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.