Meriam-Webster, Incoporate, 1995
Buku Referensi
Benet, William Rose, author
Thomas Y. Crowell, 1965
Buku Referensi
edited by Joseph T. Shipley
Littlefield, Adams, 1960
Buku Referensi
Watt, Homer A., author
Barnes & Noble, 1957
Buku Referensi
Hart, James, author
Oxford University Press, 1965
Buku Referensi