1. Donne, John: Devotions.
2. Parsons, Talcott: The Structure of Social Action. McGraw-Hill, New York. 1937.
3. Eissler, K. B.: The Psychiatrist and the Dying Patient. International Universities Press. New York. 1955.
4. Bacon, Francis: Two Essays on Death.
5. Webster, John: The Duchess of Malfi, L. 222.