Analysis of information sources in references of the Wikipedia article "Sheol" in English language version.
Rainwater, Robert (1990). "Sheol". In Mills, Watson E. (ed.). Mercer Dictionary of the Bible. Mercer University Press. ISBN 9780865543737."Sheol ... is the OT word for the underworld or unseen world of the dead where departed spirits go ... It was a place of stillness, darkness, ..."