Oberlin, Loriann Hoff, author
[American Management Association, ], 2004
eBooks
Carnegie, Dorothy, author
Dale Carnegie and Associates, 1962
Buku Teks
Seagraves, Theresa, author
American Society for Training and Development Press, 2004
eBooks
Guth, Hans P., author
Wadsworth, 1969
Buku Teks
selected and introduced by Carl Harrison-Ford; foreword by Osmar White
Lothian , 1986
Buku Teks