Scott, Gini Graham, author
American Management Association, 2009
eBooks
Newport, Cal, author
Noura Books, 2016
Buku Teks
Tam, Marilyn, author
Gramedia Pustaka Utama, 2007
Buku Teks
Siegel, Liza, author
American Management Association, 2006
eBooks
Leigh, Andrew
Gramedia , 2006
Buku Teks