Walker, Geraldene, author
Libraries Unlimited, 1993
Buku Teks
Walker, Geraldene, author
Libraries Unlimited, 1993
Buku Teks
edited by C.J. Armstrong and Andrew Large
Gower, 2001
Buku Referensi
Ridley, Damon D., author
John Wiley & Sons, 1996
Buku Teks
Hartley, R.J., author
Bowker-Saur, 1990
Buku Teks