Hornby, Albert Sydney, author
Oxford University Press, 1991
Buku Referensi
Dictionary Publication, 1981
Buku Referensi
Scharfstein, Zevi, author
America : Shilo Publishing House, 1073
Buku Referensi
Fucilla, Joseph G., author
Follett Publishing Company, 1964
Buku Referensi
revised by J.R.V. Marchant and Joseph F. Charles
Cassell, 1952
Buku Referensi