Maciejewski، Paul K.؛ Zhang، Baohui؛ Block، Susan D.؛ Prigerson، Holly G. (2007). "An Empirical Examination of the Stage Theory of Grief". Journal of the American Medical Association. ج. 297 ع. 7: 716–23. DOI:10.1001/jama.297.7.716. PMID:17312291.
nih.gov
pubmed.ncbi.nlm.nih.gov
Maciejewski، Paul K.؛ Zhang، Baohui؛ Block، Susan D.؛ Prigerson، Holly G. (2007). "An Empirical Examination of the Stage Theory of Grief". Journal of the American Medical Association. ج. 297 ع. 7: 716–23. DOI:10.1001/jama.297.7.716. PMID:17312291.