Salverda, Reinier
I.C.G. Printing, 1985
Buku Teks
Forrest-Thomson, Veronica
Manchester University Press, 1978
Buku Teks
Brown, Richard H.
Cambridge University Press, 1977
Buku Teks
Leeming, Glenda
Macmillan, 1989
Buku Teks
Lewis, C. Day
Jonathan Cape, 1949
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