Walton, Donald
Are you communicating?: you can't manage without it
McGraw-Hill , 1989
 Buku Teks SO
Cleary, Jon
You can't see round corners
Collins Publishers Australia, 1947
 Buku Teks SO
The Cultural economy
Helmut Anheier, Yudhishthir Raj Isar, editor
SAGE Publications, 2008
 Buku Teks SO
Novak, Brenda
No one but you = Hanya dirimu
PT Gramedia Pustaka Utama, 2018
 Buku Teks SO
Vernon, Philip E.
Intelligence and cultural environment
Methuen, 1972
 Buku Teks SO