Her Majesty's Stationery Office, 1987
Buku Referensi
London: Her Majesty's Stationary office, 1987,
Buku Referensi
Harrold, Ann
Library Association, 1986
Buku Referensi
Davies, Celia
Routledge, 2000
Buku Teks SO
Park, Patricia, author
Kluwer Law International, 2012
Buku Teks