Honestly, I only have one citation here because most of this is just from experience over my 11+ years in ADF.
Thomas, Kirk. “The Nature of Sacrifice.” Ár NDraíocht Féin: A Druid Fellowship. N.p., n.d. Web. 23 Oct. 2014. <https://www.adf.org/articles/cosmology/nature-of-sacrifice.html>.
