Webb, James
A Country such as this
Bantam Books, 1985
Buku Teks
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
Pilger, John
A Secret country
Jonathan Cape, 1980
Buku Teks