Oxford University Press, 1996
Buku Referensi
edited by Michael Allaby
Oxford University Press, 1994
Buku Referensi
Kennedy, Michael
Oxford University Press, 1996
Buku Referensi
edited by Phyllis Hartnoll and Peter Found
Oxford University Press , 1992
Buku Referensi
Warrack, John
Oxford University Press, 1996
Buku Referensi