Tracy, Brian, author
American Management Association, 2002
eBooks
Richards, Dick
Jossey-Bass , 1994
Buku Teks
Brown, Les, 1945-
Tian Xian Wen hua Chuban Gufen You Xian Gongs, 1994
Buku Teks
Morris, Tom
Tianxia Wenhua Chubanshe, 1996
Buku Teks
Ziglar, Zig, author
Heinemann Asia, 1995
Buku Teks