Blaise, Clark
Tribal Justice
General Publishing, 1974
 Buku Teks SO
Corry, Stephen
Tribal peoples : for tomorrow's world
Freeman Press, 2011
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Rosile, Grace Ann
Tribal wisdom for business ethics
Emerald, 2016
 eBooks
Doren, Charles van
The idea of progress
Frederick A. Praeger , 1967
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Collingwood, R.G.
The idea of history
Clarendon Press, 1946
 Buku Teks SO