Krutch, Joseph Wood, author
Random House, 1959
Buku Teks
Krutch, Joseph Wood, author
Greenwood Press, 1979
Buku Teks
Baumeister, Roy F., author
Thomson, 2008
Buku Teks
Baumeister
2009
Buku Teks
Hume, David, author
Oxford University Press, 2000
Buku Teks