Goldstein, E. Ernest
Foundation Press, 1959
Buku Teks
Gervais, Daniel J.
Edward Elgar Publishing, 2017
Buku Teks
Kokkoris, Ioannis
Sweet & Maxwell, 2010
Buku Teks
Morris, John Humphrey Carlile
At The Clarendon Press, 1960
Buku Teks
Pugh, Richard Crawford
St.paul Minn, 1993
Buku Teks