Martin, William J.
Aslib Gower, 1995
Buku Teks
Currie, Wendy
John Wiley & Sons, 2000
Buku Teks
Currie, Wendy
John Wiley & Sons, 2000
Buku Teks
Dalrymple, Douglas J.
Chichester : Wiley, Chichester : Wiley
Buku Teks
Barber, William J.
Stanford University, 1961
Buku Teks