Lua APA (7ú heag.)

Não informado. (1933). Population. International Union for the Scientific Investigation of Population.

Lua i Stíl Chicago (17ú heag.)

Não informado. Population. London: International Union for the Scientific Investigation of Population, 1933.

Lua MLA (8ú heag.)

Não informado. Population. International Union for the Scientific Investigation of Population, 1933.

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