League of Nations. (1928). Official vital statistics of Switzerland. [s.n.].
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLeague of Nations. Official Vital Statistics of Switzerland. Geneva: [s.n.], 1928.
एमएलए (9वां संस्करण) प्रशस्ति पत्रLeague of Nations. Official Vital Statistics of Switzerland. [s.n.], 1928.
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