Oxford University Press, New York
Buku Referensi
edited by Catherine Soanes and Angus Stevenson
Oxford University Press, 2006
Buku Referensi
Oxford University Press, 1942
Buku Referensi
edited by Ian Chilvers
Oxford University Press , 1990
Buku Referensi
edited by Leslie Rutherford
Sweet & Maxwell, 1993
Buku Referensi