Blundell, Nigel
Octopus Books Limited, 1980
Buku Teks
Dunham, Barrows
Little, Brown and Company, 1947
Buku Teks SO
Evans, Bergen, 1904-
A. A. Knopf, 1965
Buku Teks SO
Wrenn, Chase B., 1974-
Polity, 2015
Buku Teks SO
[publisher not identified], [date of publication not identified]
Naskah