Wharton, Edith, author
The custom of the country
Random House, 1994
 Buku Teks
Webb, James, author
A Country such as this
Bantam Books, 1985
 Buku Teks
Martin, Virginia, author
Law and custom in the steppe
Curzon, 2001
 Buku Teks
Ingpen, Robert, author
A Celebration of custom and rituals of the world
Dragon`s World, 1994
 Buku Referensi
Valenti, Diane, author
Purchasing custom e-learning solutions
American Society for Training & Development, 2011
 eBooks
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