Bryan A. Garner, editor in chief
West Publishing, 1999
Buku Referensi
Collin, P. H., author
Peter Collin Publishing, 1997
Buku Referensi
Bates, Robert L., editors
Anchor Books, 1984
Buku Referensi
Oxford University Press, 1990
Buku Referensi
Eckersley, C. E. (Charles Ewart), 1892-1967, author
Longmans, Green and Co., 1953
Buku Referensi