Menninger, Karl
Basic Books, 1963
Buku Teks
Lear, Jonathan, author
Routledge, 2005
Buku Teks
Sarafino, Edward P., author
John Wiley & Sons, 1990
Buku Teks
Radley, Alan
Thousand Oaks Sage , 1994
Buku Teks
World Health Organization
World Health Organization, 1981
Buku Teks