Devins, Delbert W.
John Wiley & Sons, 1982
Buku Teks
Pergamon Press, 1979
Buku Teks
prepared by 142 specialists ; Douglas M. Considine, editor-in-chief
McGraw-Hill, 1996
Buku Referensi
edited by Bob Everett, Godfrey Boyle, Stephen Peake and Janet Ramage
Oxford University Press, 2012
Buku Teks
Ramage, Janet, 1932-, author
Oxford University Press, 1983
Buku Teks