Rankin, RT Hon Sir George Claus
At The University Press, 1946
Buku Teks
Costa, Horacio de la, author
Carmelo and Bauermann, 1965
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Menski, Werner F., author
Curzon Press, 2001
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Canby, William C.
West Publishing Company, 1981
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Dhagamwar, Vasudha
Sage , 1992
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