edited by Mel Schwartz
John Wiley & Sons, 2002
Buku Referensi
John Wiley & Sons, 2002
Buku Referensi
Kluwer Academic Publishers, 1995,
Buku Referensi
Timings, Roger Leslie, 1927-
Longman Scientific, 1989
Buku Teks
edited by, Andrew M. Colman
Routledge, 1994
Buku Referensi