Wood, James, author
Warner , 1958
Buku Referensi
N. A. L. Signet Books,
Buku Referensi
edited by Catherine Soanes and Angus Stevenson
Oxford University Press, 2006
Buku Referensi
Heaton, J.B., author
Longman, 1987
Buku Referensi
Geddes & Grosset, 2000
Buku Referensi