Amoruso, Sophia, author
Noura Books, 2015
Buku Teks
Amoruso, Sophia, author
Penguin, 2014
Buku Teks
Kleon, Austin, author
Bentang, 2016
Buku Teks
Solovic, Susan Wilson, author
American Management Association, 2008
eBooks
Shefsky, Lloyod E.
McGraw-Hill, 1994
Buku Teks