Henderson, I. F.
Longman, 1975
Buku Referensi
R & R Newkirk/Longman, 1985
Buku Referensi
Bryan A. Garner, editor in chief
West Publishing, 1999
Buku Referensi
Bates, Robert L., editors
Anchor Books, 1984
Buku Referensi
Oxford University Press, 1990
Buku Referensi