1. Multiple regression: Testing and interpreting interactions;Aiken,1991
2. Symptom checklist. Handleiding bij een multidimensionele psychopathologie-indicator;Arrindell,2003
3. Cognitive therapy and the emotional disorders;Beck,1976
4. Cognitive therapy of depression;Beck,1979
5. Gender differences in complicated grief among the elderly;Bierhals;Omega—Journal of Death and Dying,1996