edited by Frank O. Colby
Thomas Y. Crowell, 1950
Buku Referensi
Bryson, Bill, author
Penguin Books, 1987
Buku Referensi
Kenyon, John Samuel, author
Merriam-Webster ; G. & C. Merriam Co., 1953
Buku Referensi
Jones, Daniel, author
Dent, 1940
Buku Referensi
Jones, Daniel, author
Cambridge University Press, 1992
Buku Referensi