Hutton, J.H.
Caste in India : its nature, function, and origins / by J.H. Hutton
Cambridge University Press , 1946
 Buku Teks SO
Ward, C.H.S
Outline of Buddhism / C. H. S. Ward
The Epworth Press, 1934
 Buku Teks SO
Saunders, Kay
Workers in bondage: the origins and bases of unfree labour in Queensland, 1824-1916 / kay Saunders
University of Queensland Press, 1982
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Pastoureau, Michael
Heraldry its origins and meaning
London Thames and Hudson 1997
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Sellery, G. C.
Renaissance: its nature and origins
Madison: University of Wisconsin Press, 1950
 Buku Teks SO