Vandome, Nick
Effective communications in easy steps
Financial World, 2012
 Buku Teks SO
Cahyadi Kurniawan, Author
It's Easy... Building Up A Business: 6 langkah Membangun Bisnis yang Menguntungkan dan Terus Berkembang Tanpa Perlu "Diawasi"
Gramedia Pustaka Utama, 2013
 Buku Teks SO
Lewis, Lynn S.
10 steps to successful presentations
American Management Association, 2008
 eBooks
Lewis, Lynn Sparapany
10 steps to successful meetings
American Society for Training & Development, 2008
 eBooks
Hendro
How to become a smart entrepreneur and to start a new business
Andi, 2005
 Buku Teks SO