Chew, Sally
Business etiquette : an essential guide for executives / Sally Chew
Times Books International, 1995
 Buku Teks SO
Hutabarat, Hermin
Etiket
Gunung Mulia, 1989
 Buku Teks
Post, Peggy
Emily Posts Etiquette
HarperCollins Publishers, 2004
 Buku Teks
Hoedojo Hoed
Serba-serbi keprotokolan / Hoedojo Hoed
Balai Pustaka, 1994
 Buku Teks
Mayeroff, Milton
Seni memperhatikan
Gramedia Pustaka Utama, 1993
 Buku Teks SO