Smith, Jim, author
American Society for Training & Development, 2008
eBooks
Chishti, Amatullah Armstrong, author
Paramount Publishing Enterprise, 2005
Buku Teks
Parker, John, author
Headline, 2005
Buku Teks
Chesson, Keith, author
Dent, 1988
Buku Teks
Sulliva, Robert, author
Time Warner Trade, 2001
Buku Teks