Palmer, E.H., author
Routledge & Kegan Paul, 1956
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Marsden, William, author
Oxford University Press, 1984
Buku Referensi
Lanyon-Orgill, Peter A., author
Luzac & Co., 1944
Buku Referensi
Boyle, John Andrew, author
Luzac & Company, 1949
Buku Referensi
Preobrazhensky, A. G., author
Columbia University Press, 1951
Buku Referensi