21C hit design hit brand and logo, volume 2
DNBooks, 2008
 Buku Referensi
Perkins, John
Confessions of an economic Hit Man
Berrett-Kochler, 2004
 Buku Teks
Perkins, John
Confessions of an economic hit man
Abdi Tandur, 2005
 Buku Teks
Perkins, John
Confessions of an economic hit man
Abdi Tandur, 2005
 Buku Teks
Perkins, John
The new confessions of an economic hit man
Berrett-Koehler Publishers, 2016
 Buku Teks