William J. Buckley, Karen S. Feldt, editor and introduction
McGraw-Hill, 2013
Buku Teks
Routledge, 1997
Buku Teks
edited by George E. Dickinson and Michael R. Leming
McGraw-Hill, 2007
Buku Teks SO
Kubler-Ross, Elisabeth, author
Macmillan, 1981
Buku Teks SO
Benton, Richard G., author
Van Nostrand Reinhold, 1978
Buku Teks