Webb, James
A Country such as this
Bantam Books, 1985
 Buku Teks SO
Martin, Virginia
Law and custom in the steppe
Curzon, 2001
 Buku Teks
Ingpen, Robert
A Celebration of custom and rituals of the world
Dragon`s World, 1994
 Buku Referensi
Valenti, Diane
Purchasing custom e-learning solutions
American Society for Training & Development, 2011
 eBooks
Norden, Mary
Modern country
Conran Octopus Limited, 2000
 Buku Referensi