Abrahamson, James L (1976). "David Starr Jordan and American Antimilitarism". The Pacific Northwest Quarterly67 (2): 76–87. JSTOR40489774.
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David Starr Jordan The Blood of the Nation: A Study of the Decay of Races through the Survival of the Unfit. (copyright 1902, reprinted 1910) p 12. Nota: o termo "raza" aparece más de 30 veces neste breve libro. O terno "euxenesia" non está aí, pero se describe o concepto básico.