edited by Peter Holloway
Currency Press, 1987
Buku Teks
Rees, Leslie, 1905-2000
Angus and Robertson, 1953
Buku Teks
Evans, B. Ifor
Penguin Books , 1948
Buku Teks
edited by Barrett H. Clark and George Freedley
D. Appleton-Century, 1947
Buku Teks
Oxford University Press, 1981
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