1. Habenstein Robert W., and Lamers William M. The History of American Funeral Directing, Milwaukee, Wisconsin: Bulfin Printers Inc., 1955, p. vii.
2. Bowman Leroy, The American Funeral Director, Washington, D.C.: Public Affairs Press, 1959, p. vii.
3. Mitford Jessica, The American Way of Death, London: Simon & Schuster and Co., 1963, p. 9.
4. Weber Max, The Theory of Social and Economic Organizations, trans. by Henderson A. M. and Parsons Talcott, New York: Oxford University Press, 1947, p. 88.