Wingate, Isabel B. (Isabel Barnum)
Know your merchandise for retailers and consumers
McGraw-Hill, 1984
 Buku Teks SO
Penerapan know your customer principle di Indonesia
 Artikel Jurnal
Nabilah Nindita Putri Rusman
Penggunaan strategi komunikasi dalam kampanye kesehatan Know Your Lemons = The communication strategy in Know Your Lemons health campaign
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2017
 UI - Makalah dan Kertas Kerja
Kaplan, Burton
Everything you need to know to talk your way to success
Prentice-Hall, 1995
 Buku Teks SO
Mattone, John
Intelligent leadership: what you need to know to unlock your full potential
[American Management Association, ], 2013
 eBooks