Wichman, K., author
New York, David Mckay Company
Buku Referensi
Wely, F Prick van, author
London, Cassell
Buku Referensi
London, 1982
Buku Referensi
Fowler, H. W. (Henry Watson), 1858-1933, author
New York Oxford University Press 1965
Buku Referensi
Jones, Daniel
Berlin : Verlag und Druck Von, 1911
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