Slapper, Gary
Cavendish Publishing Limited, 2000
Buku Teks
Geldart, William, 1870-1922
Oxford University Press, 1991
Buku Teks
Keenan, Denis
Pitman, 1989
Buku Teks
O`Connor, J.F., 1931-
Hants Gower, 1990
Buku Teks
disusun oleh Sofia Rangkuti-Hasibuan ; editor, Nung Atasana
Gramedia Pustaka Utama, 1992
Buku Teks