Herr, Paul, 1955- , author
American Management Association;, 2009
eBooks
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