Malthus’ Principle of Population. BRIA 26 2 The Debate Over World Population: Was Malthus Right? 26. Constitutional Rights Foundation (CRF). Winter 2010 [2016-04-07]. (原始内容存档于2021-06-03).|issue=被忽略 (帮助)
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Malthus’ Principle of Population. BRIA 26 2 The Debate Over World Population: Was Malthus Right? 26. Constitutional Rights Foundation (CRF). Winter 2010 [2016-04-07]. (原始内容存档于2021-06-03).|issue=被忽略 (帮助)