Heaven and Hell in Jewish Tradition: http://www.myjewishlearning.com/beliefs/Theology/Afterlife_and_Messiah/Life_After_Death/Heaven_and_Hell.shtml
The Book of Psalms: http://www.myjewishlearning.com/texts/Bible/Writings/Poetic_Writings/Book_of_Psalms.shtml
Psalm 6 – "A Deep Depression" translated by Rabbi Benjamin J. Segal: http://psalms.schechter.edu/2010/03/psalm-6-deep-depression-initial-note.html
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Rabbi Menachem Creditor