Huffington, Arianna, author
Harmony Books, 2015
Buku Teks
Baber, Anne, author
American Management Association, 2007
eBooks
Darling, Diane, author
Media Global Edukasi, 2005
Buku Teks
Kotter, John P., 1947-, author
Prenhallindo, 1997
Buku Teks
Cleaver, Joanne, 1958-, author
McGraw-Hill, 2012
Buku Teks