Kempin, Frederick G
Historical introduction to anglo American law in a nutshell
West Publishing Co, 1973
 Buku Teks
Doe, Norman
Fundamental authority in late medieval English law
Cambridge University Press, 1990
 Buku Teks
Hanbury, Harold Grenville
A history of English law; Vol. I
Methuen, 1956
 Buku Teks
Holdsworth, William, Sir
A History of English law; Vol. XI
Methuen, 1938
 Buku Teks
Powicke, Maurice
The thirteenth century, 1216-1307
At the Clarendom Press, 1962
 Buku Teks SO