References
- G Etiope, G Papatheodorou, D Christodoulou, M Geraga, and P. Favali. (2006). The geological links of the ancient Delphic Oracle (Greece): a reappraisal of natural gas occurrence and origin. Geology 34:821–824.
- HA Spiller, JR Hale, and JZ de Boer. (2002). The Delphic Oracle: a multidisciplinary defense of the gaseous vent theory. J Toxicol: Clin Toxicol 40:189–196. See also: de Boer JZ, Hale JR, Chanton J. New Evidence for the geological origins of the ancient Delphic Oracle Geology 2001; 29:707–710. For a popular summary, see: Hale JR, de Boer JZ, Chanton J, Spiller, HA. Questioning the Delphic Oracle. Sci Am, 67–73 (Aug 2003).
- AA Long. Stoic Psychology. K Algra et al The Cambridge History of Hellenistic Philosophy. Cambridge, UK: Cambridge University Press (1999):569.
- De. def. or. 431B. Compare Hesiod. Op 125.
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