Bruun, Ole
NIAS Press, 2011
Buku Teks
Loewe, Michael
Frederick A. Preager, 1965
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O`Malley, L.S.S. (Lewis Sydney Steward), 1874-1941
Macmillan, Cambridge, ENg. University Press, 1935
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Winzeler, Robert L.
Lanham Rowman & Littlefield, 2016
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